Mysql 自定义列的多个值
我希望每个ID都有2个自定义列值。 我该怎么做 示例表:Mysql 自定义列的多个值,mysql,sql,Mysql,Sql,我希望每个ID都有2个自定义列值。 我该怎么做 示例表: ID 1 2 3 查询示例: SELECT id, (id*2) as Custom_Value, (id*4) as Custom_Value FROM numbers 答复: ID Custom_Value 1 2 1 4 2 4 2 8 3 6 3 12 使用UNION SELECT ID, (ID*2) as CustomVal FROM tableNAme UNION
ID
1
2
3
查询示例:
SELECT id, (id*2) as Custom_Value, (id*4) as Custom_Value FROM numbers
答复:
ID Custom_Value
1 2
1 4
2 4
2 8
3 6
3 12
使用UNION
SELECT ID, (ID*2) as CustomVal FROM tableNAme
UNION ALL
SELECT ID, (ID*4) as CustomVal FROM tableNAme
ORDER BY ID