Sqlite 文本列上的索引能否加快基于前缀的查询？

在SQLite中，文本列上的索引是否可以加快基于该列上类似前缀的查询

例如，如果我有一个名为path的文本列，并且我运行一个类似于WHERE path的查询，比如“/path/to/some/dir/%”，那么该查询是否能够从该路径列上的索引中受益？

LIKE将不会从带有默认选项的索引中受益，但您可以使用GLOB或BETWEEN重写查询

解决方案1

使用常规索引：

like=>未优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

GLOB=>优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

相等=>优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

介于=>优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

glob=>未优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

更大=>未优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

相等=>未优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

between=>未优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

LIKE将不会受益于index with default选项，但您可以使用GLOB或BETWEEN重写查询

解决方案1

使用常规索引：

like=>未优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

GLOB=>优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

相等=>优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

介于=>优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

glob=>未优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

更大=>未优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

相等=>未优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

between=>未优化

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>?)

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path=?)

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path like '/path/to/some/dir/a%' ;
0|0|0|SEARCH TABLE pathdta USING COVERING INDEX ix_pathdta_dta (path>? AND path<?)

sqlite> explain query plan select * from pathdta where path GLOB '/path/to/some/dir/a*' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path >= '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta where path = '/path/to/some/dir/a' ;
0|0|0|SCAN TABLE pathdta

sqlite> explain query plan  select * from pathdta
   ...>    where path between '/path/to/some/dir/a' and '/path/to/some/dir/b' ;
0|0|0|SCAN TABLE pathdta

---

是的，它会的，有正确的索引。如果使用默认的不区分大小写的LIKE模式，索引也需要不区分大小写。还有其他的限制，请参阅完整的详细信息，它相当长，很难总结

例如：

sqlite> CREATE TABLE paths(id INTEGER PRIMARY KEY, path TEXT);
sqlite> CREATE INDEX paths_idx_path ON paths(path); -- case sensitive index
sqlite> EXPLAIN QUERY PLAN SELECT * FROM paths WHERE path LIKE 'foo%';
QUERY PLAN
`--SCAN TABLE paths
sqlite> DROP INDEX paths_idx_path;
sqlite> CREATE INDEX paths_idx_path ON paths(path COLLATE NOCASE); -- case insensitive index
sqlite> EXPLAIN QUERY PLAN SELECT * FROM paths WHERE path LIKE 'foo%';
QUERY PLAN
`--SEARCH TABLE paths USING COVERING INDEX paths_idx_path (path>? AND path<?)

---

然后索引就不需要校对了，因为它已经隐含了。

是的，如果索引正确，它会的。如果使用默认的不区分大小写的LIKE模式，索引也需要不区分大小写。还有其他的限制，请参阅完整的详细信息，它相当长，很难总结

例如：

sqlite> CREATE TABLE paths(id INTEGER PRIMARY KEY, path TEXT);
sqlite> CREATE INDEX paths_idx_path ON paths(path); -- case sensitive index
sqlite> EXPLAIN QUERY PLAN SELECT * FROM paths WHERE path LIKE 'foo%';
QUERY PLAN
`--SCAN TABLE paths
sqlite> DROP INDEX paths_idx_path;
sqlite> CREATE INDEX paths_idx_path ON paths(path COLLATE NOCASE); -- case insensitive index
sqlite> EXPLAIN QUERY PLAN SELECT * FROM paths WHERE path LIKE 'foo%';
QUERY PLAN
`--SEARCH TABLE paths USING COVERING INDEX paths_idx_path (path>? AND path<?)

---

然后索引就不需要校对了，因为它已经隐含了。

有时候，是的。有关详细信息，请参阅。有时，是的。有关详细信息，请参阅。在某些情况下，Sqlite将为您进行重写。请参阅我对原始问题的评论。@Shawn它没有在我的测试中重写，请查看我的SqlFiddle您的测试没有满足优化所需的约束条件。另外，您的手动版本不会与原始版本（如will）完全匹配。在某些情况下，Sqlite会为您进行重写。请参阅我对原始问题的评论。@Shawn它没有在我的测试中重写，请查看我的SqlFiddle您的测试没有满足优化所需的约束条件。另外，你的手动版本将无法与原始版本完全匹配。