mysql - AND not working with Nested Select sql query

Question

I have an SQL query that selects a minimum value from a column and requires another value to be equal to 1. I am using a nested select and attempting to use an AND statement. However, after adding the AND, the query results with zero results.

SELECT writer_email FROM writerdata_tb WHERE writer_active = 1 AND pending = (SELECT MIN(pending) FROM writerdata_tb) LIMIT 1

How should I fix this code to select WHERE that satisfies both?

writer_email  |  writer_active | pending
-------------   ---------------  --------
email1@mail            0            1
email2@mail            1            3
email3@mail            1            2

The query should result in email3@mail because the record has the least pending and has an active equal to 1.

Answer 1

尝试这个。

SELECT writer_email FROM writerdata_tb WHERE writer_active = 1 AND pending = (SELECT MIN(pending) FROM writerdata_tb WHERE writer_active = 1) LIMIT 1

这是由于您的第二个选择命令，它只会选择最小值，而不管 writer_active 值

Answer 2

这应该给你你所需要的，

SELECT writer_email FROM writerdata_tb WHERE writer_active=1 AND pending = (SELECT MIN(pending) FROM writerdata_tb WHERE writer_active=1) LIMIT 1

您的内部选择查询给出了1待处理的结果，并且由于没有记录 wherewriter_active=1和pending=1，因此您得到零行。