仅当匹配列不为空时

Question

I want to match column only if it is not empty 我只想匹配不为空的列

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

Where condition should be called only if phone column is not null 仅当phone列不为null时，才应调用条件

else below query should be called 否则下面的查询应该被调用

select * from users where message = 'test'

means AND phone like '%813%' should be called only if phone is not null 意味着仅当phone不为null时才应调用AND phone like '%813%'

Answer 1

Use CASE 使用CASE

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