作业帮mysql select * from lsdl_user where id in (1,2,3,4,5)中in()最多
来源：学生作业帮 编辑：作业帮 分类：综合作业 时间：2024/05/10 23:34:22
mysql select * from lsdl_user where id in (1,2,3,4,5)中in()最多能放多少数字
in()中的个数是没有限制的,
in（1,2,3）只是它的简单用法,如果你在学习in(),知道这样实现还不够,sql语句一般都是联合用的,比如 .in(select uid from .where .)
如果你在学习php 应该知道 implode（）,
比如 $uid_arr=array(.);
$uid_str=implode(',',$uid_arr);
$sql=".in({$uid_str})";
in（1,2,3）只是它的简单用法,如果你在学习in(),知道这样实现还不够,sql语句一般都是联合用的,比如 .in(select uid from .where .)
如果你在学习php 应该知道 implode（）,
比如 $uid_arr=array(.);
$uid_str=implode(',',$uid_arr);
$sql=".in({$uid_str})";
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