[SQL实践]其他常用SQL汇总 1.联表更新 update students stu inner join course on course.STUDENT_ID=stu.id set stu.name=course.ID…

2014-06-20 Created By BaoXinjian…

INDEX OF QUERIES Source Document: Purchase Order: 1: po_headers_all (sql) 2: po_lines_all (sql) 3: po_line_locations_all (sql) 4: po_distributions_all (sql) Accounting Related Data: 5: Account Code Combinations - OU "XY_瑗垮煙浜氱敵" (sql) 6: rcv_rece…

表空间碎片相关:select tablespace_name,       round(sqrt(max(blocks) / sum(blocks)) *             (100 / sqrt(sqrt(count(blocks)))),             2) FSFI,       (case         when sqrt(max(blocks) / sum(blocks)) *              (100 / sqrt(sqrt(count(blocks)))…

1.oracle数据库分页 select * from (select a.*,rownum rc from 表名 where rownum<=endrow) a where a.rc>=startrow   2.DB2数据库分页 Select * from (select rownumber() over() as rc,a.* from (select * from 表名 order by 列名) as a) where rc between startrow and endrow   3…

做了一年的业务代码开发,记录并分享一下自己平时在项目中遇到的比较好用的sql 1.查询表中是否某一字段下的数据有重复数据(以ID为例) SELECT id FROM 表名GROUP BY ID HAVING "COUNT"(ID ) > 1 2.根据sql的执行顺序来编写业务sql代码 首先要了解SQL语句的执行顺序: FROM:对FROM子句中的前两个表执行笛卡尔积(Cartesian product)(交叉联接),生成虚拟表VT1 ON:对VT1应用ON筛选器.只有那些使&l…

1.wm_concat:将返回的多行数据汇总为一列,用,分割,数据类型默认为CLOB类型 2. 递归查询(树状结构数据查询,如菜单,部门等等) SELECT [LEVEL],* FEOM table_name START WITH 条件1 CONNECT BY PRIOR 条件2 WHERE 条件3 ORDER BY 排序字段 条件1---根节点的限定条件,当然也可以放宽权限,以获得多个根节点,也就是获取多个树 条件2---连接条件,目的就是给出父子之间的关系是什么,根据这个关系进行递归查询 条…

1.查看当前应用连接,连接数突增排查 select user,SUBSTRING_INDEX(host,':',1) as ip , count(*) as count,db from information_schema.processlist where host not in ('localhost') and user not in ('replicater') group by ip order by count; 2.查看表所属及大概行数,一般加字段索引时做参考 select TAB…

创建用户 GRANT USAGE ON *.* TO 'rp'@'%' IDENTIFIED BY 'rp' MAX_UPDATES_PER_HOUR MAX_CONNECTIONS_PER_HOUR ; 解释:创建的用户是rp@%,密码是rp. 给用户授权 GRANT Create Routine, Insert, Lock Tables, References, Select, Drop, Delete, Index, Alter Routine, Create View, Create T…

select count(*) as aggregate from `yqz_feed_praise` where `uid` = '580242' and `praise_uid` <> '580242' and `time` > '1494076171';select `id`, `news_id`, `praise_uid`, `time`, `p_type` from `yqz_feed_praise` where `uid` = '577521' and `praise_uid…