select * from user_activity group by user_id,activity_id having count(*) > 1 select * from wh ...
https: blog.csdn.net wqzbxh article details SELECT concat host,uri ,ua FROM httpdataco WHERE uri LIKE BaiduApp signed 要點是concat這個函數實現拼接 實現特殊字符串進行連接用concat ws: select CONCAT WS 我是分隔符 ,username,passwd a ...
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select * from user_activity group by user_id,activity_id having count(*) > 1 select * from wh ...
select A.* from tb_mend_enrol A, (select A.Typeid, A.address from tb_mend_enrol A ...
先按字段b 分組,然后在每個分組內按字段a 進行分組: select * from tablename group by a, b 如: 我們下面再接着要求統計出每門學科每個學期有多少人選擇,應用如下SQL: ...
TP實現 ...
name1與name2相加模糊搜索 SELECT * FROM tb1 where CONCAT(name1,name2) like CONCAT('%','名稱','%') 有空格模糊搜素 S ...
聯合約束:ALTER TABLE `lywl_provider_package` ADD unique(providerId,packCode) 給一個表建唯一約束 ...
) ) 別名字段作為where條件: 在MySQL中有個特殊的規定,即不允許使用列別名作為查詢條件。比如 ...
https://zhidao.baidu.com/question/243124782.html 展開全部 select * from A inn ...