Sql server 需要帮助获得单列计数吗
我需要从两个表中获取单列的计数 代码片段Sql server 需要帮助获得单列计数吗,sql-server,stored-procedures,sql-server-2012,Sql Server,Stored Procedures,Sql Server 2012,我需要从两个表中获取单列的计数 代码片段 select ((select count(Gender) from tableA) + (select Count(Gender) from tableB)) as Total Count select ((select Sum(Case when Gender = M then 1 else 0) from tableA) + (select Sum(Case when Gender = M then
select
((select count(Gender) from tableA) +
(select Count(Gender) from tableB)) as Total Count
select
((select Sum(Case when Gender = M then 1 else 0) from tableA) +
(select Sum(Case when Gender = M then 1 else 0) from tableB)) as Male Count
select
((select Sum(Case when Gender = F then 1 else 0) from tableA) +
(select Sum(Case when Gender = F then 1 else 0) from tableB)) as Female Count
似乎可以尝试合并这两个表并应用聚合
SELECT COUNT(GENDER),SUM(CASE WHEN X.GENDER='MALE' THEN 1 ELSE 0 END)AS MALE_COUNT,
SUM(CASE WHEN X.GENDER='FEMALE' THEN 1 ELSE 0 END)AS FEMALE_COUNT
FROM
(
select gender from tablea
union all
select gender from tableb
)AS X
我试过交叉连接和它的到来。将尝试与此approach@Sergey-谢谢你的建议。即使这种方法也能工作,并且节省了代码行。请告诉我我们是否可以做些什么来获取计数,而不是在存储过程中重复相同的代码行来获取不同条件下的计数know@AMDI,很难给出一般性的建议。你能举个例子说明你到底想达到什么目的吗