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 推薦指數:
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根據兩個字段去重復 表一 Fruit數據: id num name 1 1001 西瓜 2 1002 葡萄 3 1003 西瓜 4 1004 草莓 5 1005 芒果 按照表一的數據,num ...
目錄 場景 任務(需求) 行動(解決方案) 方案1:從代碼層面解決(正確方案) 方案2:設置成兩個唯一索引(正確方案) 方案3:刪掉中間表,把從表的主鍵作為主表的外鍵,並將外鍵設置成唯一索引(正確方案) 方案4:設置成一個復合 ...
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 ...