LIKE , LEFT ,RIGHT , MID

1.普通用法
where name like '%d';
where name like '_at%';
2.不匹配时返回真 NOT LIKE
WHEE name NOT LIKE '';
3.不能判断null
SELECT NULL LIKE '%' , NULL NOT LIKE '%'
返回都为null

4.LEFT(str,3) RIGHT(str,2) MID(str,2)
LEFT('ABCDEFG',2); AB
RIGHT('ABCDEFG',2); FG
MID('ABCDEFG',2); BCDEFG

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标签：RIGHT,name,LIKE,MID,ABCDEFG,LEFT
来源： https://www.cnblogs.com/pangkai/p/16277247.html