其中count函数在where子句中的SQL查询

Question

我有表格，我正在跟踪部门和预算中心之间的关联。该协会是多对多的。现在我想只显示那些与其关联的预算中心超过10个的部门。所以我的查询应该是这样的

select dept,
       count(budget_centers) as bcCount
from myTable
where bcCount > 10
group by dept

现在oracle会给出一个错误说＆＃34; bcCount＆＃34;是无效的标识符。有没有办法重新定义oracle

中可接受的查询

Answer 1

那是having条款的用途：

select dept,
       count(budget_centers) as bcCount
from myTable
group by dept
having count(budget_centers) > 10

以下是手册的相关部分：

• http://docs.oracle.com/cd/E11882_01/server.112/e26088/statements_10002.htm#i2066419
• http://docs.oracle.com/cd/E11882_01/server.112/e26088/statements_10002.htm#SQLRF55384

Answer 2

试试这个

select dept,
       count(budget_centers) as bcCount
from myTable
group by dept
having count(budget_centers) > 10