【注意】:Oracle數據庫支持full join,mysql是不支持full join的,但仍然可以同過左外連接+ union+右外連接實現 初始化SQL語句: /*join 建表語句*/
drop database if exists test;
create database test;
use test;/* 左表t1*/
drop table if ex
bitsCN.commysql列轉行以及年月分組Java代碼SELECT count(DISTINCT(a.rect_id)) zcount, a.job_dept, DATE_FORMAT(submit_date, '%Y-%m') zsubmit_date FROM 表名 a WHERE a.statu = 3 AND a.rstatu = 2 AND a.job_dept IN ('19', '20',
語法很簡單,意義卻很重大!16.3.10?Delayed Replicationmysql開啟多線程復制、MySQL 5.7 supports delayed replication such that a slave server deliberately lags behind the master by at least a specified amount of time. The default delay is 0 second