luna SQL精华语句总结04

           SQL基础语句

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【1】分组查询

SELECT*FROM emp ORDER BY deptno;

【2】内联语句

SELECT m.*,d.*FROM emp m INNER
JOIN dept d on m.deptno=d.deptno

SELECT * FROM emp e INNER JOIN dept d on e.deptno=d.deptno
【3】分组、内联结合
SELECT xin.*,d.dname,d.loc from 
(SELECT deptno,sum(sal),COUNT(empno) from emp group by deptno) xin 
INNER JOIN dept d on xin.deptno=d.deptno;

SELECT emp.deptno,dept.dname  from emp INNER JOIN dept ON emp.deptno=dept.deptno GROUP BY emp.deptno;
  [4] having between and语法

SELECT deptno,count(empno),sum(sal) for emp GROUP BY deptno HAVING avg_sal>2000 and sal<5000

BETWEEN 200 and 2500

[5]link语法 分页

SELECT * from emp ORDER BY   sal  LIMIT 1,2

效果图