如何使用在

Question

究竟是什麼statment正確的語法選擇計數：

select * 
from notices 
where count(select * from notices where no_type = 'p' 
     or no_type = 'n') > 3 

Answer 1

這不是編寫一個查詢的最佳方式，但如果你真的需要它，這可能工作

select * from notices as a 
where (select count(*) from notices as b where no_type = 'p' 
    a.someColumn = b.someColumn) > 3 or (select count(*) from notices as c where 
    or no_type = 'n' and a.someColumn = c.someColumn) > 3