selectdepartment_id,avg(salary) avg_salary,count(*) cnt,max(salary) max_salary,min(salary) min_salary,sum(salary) sum_salaryfromemployeesgroupbydepartment_idhavingavg(salary)>10000orderby1; HAVING出现在GROUP BY之后,也
4.只有SELECT子句、HAVING子句、ORDER BY子句里面能使用聚合函数。 HAVING 使用GROPU BY子句,得到将表分组后的结果。 使用HAVING子句,指定分组的条件,从分组后的结果里面选取特定的组。 格式: SELECT<列名1>,<列名2>,...FROM<表名>WHERE GROUP BY<列名1>,<列名2>,...;HAVING<分组结果对应的条件> 下面这个,...
SELECT designame, SUM(salary),MAX(salary),MIN(salary),AVG(salary) FROM employee WHERE deptno=15 GROUP BY designame HAVING AVG(salary)>7000; CopyOutput:Explanation:In the above example, the WHERE clause will retrieve the rows of department 15 from employee table. The GROUP BY clause will ...
SELECT COUNT(*),department_id FROM employees GROUP BY department_id HAVING COUNT(*)>5; -- 案例2:每个工种有奖金的员工的最高工资>12000的工种编号和最高工资 SELECT MAX(salary),job_id FROM employees WHERE commission_pct IS NOT NULL GROUP BY job_id HAVING MAX(salary)>12000; -- 案例3:领导编...
SQL> select deptno,max(sal),min(sal),avg(sal) 2 from emp 3 where sal > 1200 4 group by deptno 5 having avg(sal)>1500 6 order by avg(sal) desc; DEPTNO MAX(SAL) MIN(SAL) AVG(SAL) --- --- --- --- 20 3000 2975 2991.66667 10 5000 1300 2916.66667...
postgresql having用法 在postgresql中,having子句是用于进行分组后的条件筛选的子句。 与where子句不同,having子句是用于分组后的结果集中进行条件筛选,而where子句是用于从数据表中进行条件筛选。 having子句中使用的条件表达式必须包含在分组函数中,如sum、avg、min、max等函数,否则会报错。 例如,以下查询语句用于查找...
[ HAVING condition [, ...] ] [ WINDOW window_name AS ( window_definition ) [, ...] ] [ { UNION | INTERSECT | EXCEPT } [ ALL | DISTINCT ] select ] [ ORDER BY expression [ ASC | DESC | USING operator ] [ NULLS { FIRST | LAST } ] [, ...] ] ...
[ HAVING condition [, ...] ] [ WINDOW window_name AS ( window_definition ) [, ...] ] [ { UNION | INTERSECT | EXCEPT } [ ALL | DISTINCT ] select ] [ ORDER BY expression [ ASC | DESC | USING operator ] [ NULLS { FIRST | LAST } ] [, ...] ] [ LIMIT { count | ALL ...
该查询不能在顶层包含以下任一子句:HAVING、LIMIT、DISTINCT、WITH、INTERSECT、EXCEPT、OFFSET和LIMIT。使用简单查询创建的视图可以进行更新,使用复杂查询创建的视图则不可以,但是可以使用规则更新复杂视图。还支持材料化视图;可以使用REFRESH MATERIALIZED VIEW语句更新材料化视图中的数据。
distinct,sum,max/min,group by /having 安装并配置,并设置远程登陆的用户名和密码 1 .安装postgreSQL sudo apt-get update主程序:sudo apt-get install postgresql数据库图形界面:sudo apt install pgadmin3在Ubuntu下安装Postgresql后,会自动注册为服务,并随操作系统自动启动。 在Ubuntu下安装Postgresql后,会自动添加...