Node——mysql 查询字段是否为空

如何设置条件

• isnull()

select * from users where email = 'xxxx' and isnull(deletedAt) 

• is null

select * from users where email = 'xxxx' and deletedAt is null

• is not null

select * from users where email = 'xxxx' and deletedAt is not null

• !isnull()

select * from users where email = 'xxxx' and !isnull(deletedAt) 

select * from users where email = 'xxxx' and not isnull(deletedAt) 

• isfull

• 当查询条件为 null，用指定字符替代

select name,  isfull(gender,'未知') as gender  from users where email = 'xxxx'