select * from emp where ename like '%zhang%'
select * from emp where ename like 'zhang%'
select * from emp where ename like '%zhang'这三条sql查询那一条索引有效,高手解释下,在线等回复!!
select * from emp where ename like 'zhang%'
select * from emp where ename like '%zhang'这三条sql查询那一条索引有效,高手解释下,在线等回复!!
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