僅當匹配列不為空時

Question

我只想匹配不為空的列

select *
from users
where message = 'test' AND phone like '%813%'

僅當phone列不為null時，才應調用條件

否則下面的查詢應該被調用

select * from users where message = 'test'

意味着僅當phone不為null時才應調用AND phone like '%813%'

Answer 1

使用CASE

select *
from users
where message = 'test' AND 
    case when phone is not null 
    then phone like '%813%'
    else 1 end