Mysql 如何限制一次插入到中的记录数
我想像这样插入我的数据库。但表中可能有200000多条记录。我想将插入拆分为10000个左右的组,如何仅在MySQL中有效地执行此操作Mysql 如何限制一次插入到中的记录数,mysql,mysql5,Mysql,Mysql5,我想像这样插入我的数据库。但表中可能有200000多条记录。我想将插入拆分为10000个左右的组,如何仅在MySQL中有效地执行此操作 INSERT INTO `slugs` (`sku`, `tablename`) select `SKU`, 'tableA' from `tableA` WHERE `SKU` NOT IN (select `sku` from `slugs` where `tablename` = 'tableA'); 示例代码:在末尾添加一个限制10000,并运行它直到
INSERT INTO `slugs` (`sku`, `tablename`)
select `SKU`, 'tableA'
from `tableA`
WHERE `SKU` NOT IN
(select `sku` from `slugs` where `tablename` = 'tableA');
示例代码:在末尾添加一个
限制10000
,并运行它直到插入的行数=0
如果不是一次性操作,您可以在循环过程中执行此操作。在末尾添加
限制10000
,并运行它直到插入的行数=0
如果不是一次性的,您可以在循环过程中执行此操作。尝试以下操作:
SET @rank=0;
select rank
, IF(MOD(rank,10000)=0,CONCAT(IF(MOD(rank,10000)=1,CONCAT("insert ignore into table values (""",NAME,""",""",SKU,""")"),CONCAT(",(""",NAME,""",""",SKU,""")")),";"),IF(MOD(rank,10000)=1,CONCAT("insert ignore into table values (""",NAME,""",""",SKU,""")"),CONCAT(",(""",NAME,""",""",SKU,""")"))) as insert_statement
from (
SELECT @rank:=@rank+1 AS rank,NAME,SKU
from tablea
) der
试试这个:
SET @rank=0;
select rank
, IF(MOD(rank,10000)=0,CONCAT(IF(MOD(rank,10000)=1,CONCAT("insert ignore into table values (""",NAME,""",""",SKU,""")"),CONCAT(",(""",NAME,""",""",SKU,""")")),";"),IF(MOD(rank,10000)=1,CONCAT("insert ignore into table values (""",NAME,""",""",SKU,""")"),CONCAT(",(""",NAME,""",""",SKU,""")"))) as insert_statement
from (
SELECT @rank:=@rank+1 AS rank,NAME,SKU
from tablea
) der
为什么要拆分插入内容?速度非常慢,有人告诉我,如果将插入内容拆分为多个事务,可能会加快速度。为什么要拆分插入内容?速度非常慢,有人告诉我,如果将插入内容拆分为多个事务,可能会加快速度。