select A.* from tb_mend_enrol A, (select A.Typeid, A.address from tb_mend_enrol A ...
select from user activity group by user id,activity id having count gt select from white list group by num code,activity id having count gt ...
2020-01-17 13:42 0 3484 推荐指数:
select A.* from tb_mend_enrol A, (select A.Typeid, A.address from tb_mend_enrol A ...
https://blog.csdn.net/wqzbxh/article/details/84649485 SELECT concat(host,uri),ua FROM httpdataco WHE ...
sqlserver根据两个字段去重复 表一 Fruit数据: id num name 1 1001 西瓜 2 1002 葡萄 3 1003 西瓜 4 1004 草莓 5 1005 芒果 按照表一的数据,num ...
目录 场景 任务(需求) 行动(解决方案) 方案1:从代码层面解决(正确方案) 方案2:设置成两个唯一索引(正确方案) 方案3:删掉中间表,把从表的主键作为主表的外键,并将外键设置成唯一索引(正确方案) 方案4:设置成一个复合 ...
select * from (select xm,je from table) a , (select xm01,je01 from table) bwhere a.xm = b.xm01and a. ...
先按字段b 分组,然后在每个分组内按字段a 进行分组: select * from tablename group by a, b 如: 我们下面再接着要求统计出每门学科每个学期有多少人选择,应用如下SQL: ...
TP实现 ...
name1与name2相加模糊搜索 SELECT * FROM tb1 where CONCAT(name1,name2) like CONCAT('%','名称','%') 有空格模糊搜素 S ...