mysql字段空值在前端怎么检验

有5种方法进行查询：

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

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

is not nullselect * 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'

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