select order_id FROM yzj_store_order t WHERE (t.user_id,t.order_status) IN ( SELECT user_id,order_status FROM yzj_store_order where order_status=0 AND DATE_FORMAT( create_date, '%Y-%m-%d' ) = DATE_FORMAT( CURDATE( ) - 0, '%Y-%m-%d' ) GROUP BY user_id
//查询#SELECT * FROM user_cawefwfrd where usewwr_cawrqqd_qaid=2252227//删除#DELETE FROM user_cauyuyurd where uwwid=10122255//更新#update uuuuser set thumb='000.jpg' where uiwwd=10122222255;
SELECT d.name AS 表名 , f.value AS 表说明, 字段序号 = a.colorder , 字段名 = a.name , 标识 THEN '√' ELSE '' END , 主键 FROM sysobjects WHERE xtype = 'PK' AND name IN ( SELECT name FROM sysindexes WHERE indid IN ( SELECT indid FROM sysindexkeys WHERE id = a.id AND col
with ash as (select /*+ materialize*/* from DBA_HIST_ACTIVE_SESS_HISTORY where sample_time between timestamp '2015-03-18 15:00:00' and timestamp '2015-03-18 15:01:00'), chains as ( select session_id, level lvl, sys_connect_by_path
)) ),sortNum int) as BEGIN DECLARE @sortNum int --得到当前id的父id, select @id = ParentId, @sortNum =Sortnum from Sys_Departments where keyId = @id and ParentId is not NULL BEGIN --循环输入插入 insert into @t_level select @id, @sortNum --------------------------
select count(case 分数字段 when 100 then 1 end) as [满分],count(case when 分数字段 between 90 and 99 then 1 end) as[90-99分],count(case when 分数字段 between 80 and 89 then 1 end) as[80-89分],count(case when 分数字段 between 70 and 79 then 1 end) as[70-79分],count(case w
在MS SQL2005中的方法: 1)select * from user where name collate Chinese_PRC_CS_AS like 'A$%B%' escape '$'; 或者 select * from user where name like 'A$%B%' escape '$' collate Chinese_PRC_CS_AS; collate Chinese_PRC_CS_AS放在like前后都可以. 2)select * from user where n
select name from sysobjects where xtype='TR' --所有触发器select name from sysobjects where xtype='P' --所有存储过程select name from sysobjects where xtype='V' --所有视图select name from sysobjects where xtype='U' --所有表 --以上为SqlServer用法 Select object_name From user_
一.MySQL数据库的下载及安装 https://www.mysql.com/ 点击DOWNLOADS,拉到页面底部,找到MySQL Community(GPL)Downloads,点击 选择下图中的MySQL Community Server 选择想要的版本进行下载 之后的步骤,因为本人已经安装过MySQL数据库,而卸载重装会比较麻烦,卸载不干净会导致新的装不上,所以可以参考下面的博客,因为官网的改动,前面的部分已经与该博客不符,按照本人在上面的介绍寻找即可 https://blog.csdn
original: https://www.mssqltips.com/sqlservertip/1414/run-same-command-on-all-sql-server-databases-without-cursors/ --This query will return a listing of all tables in all databases on a SQL instance: ) SELECT @command = 'USE ? SELECT name FROM sysob
一:理解sql执行顺序 在sql中,第一个被执行的是from语句,每一个步骤都会产生一个虚拟表,该表供下一个步骤查询时调用,比如语句:select top 10 column1,colum2,max(column3) from user where id>1 group by column1,colum2 having count(column1)>1 order by colum2. sqlserver 2005 各个环节简单介绍: ()))<Top Num> <selec
1.我们在设计表的时候,尽量让字段拥有默认值,尽量不要让字段的值为null. 因为,在 where 子句中对字段进行 null 值判断(is null或is not null)将导致引擎放弃使用索引而进行全表扫描. select id from t where num is null --可以在num上设置默认值0.确保表中num列没有null值.然后这样查询: select id from t where num=02.应尽量避免在 where 子句中使用!=或<>操作符.否则将引擎放弃使用
