sql-从一列中查找值以从另一列中查找所有其他值

Question

This is a SQL question, I will try my best to explain.

I have a table like the following below

id  name    accounts
1   Jim 7001
1   Jim 7002
1   Jim 7003
2   Ryan    7001
3   Todd    7001
3   Todd    7003
2   Ryan    7002
4   Cam 7001
5   Fran    7001
2   Ryan    7003
1   Jim 7004

I am first trying to find all values with accounts column of '7001' to find the correct id's. After that I need to only pull the lines with those id's so I can see all the accounts for those specific ids.

example code I am using

select 
s.id,
s.name,
s.account

from 
students s

where
s.account in ('7001','7002','7003','7004')

---

I can do this with 2 queries one to find id's with '7001' account value and then run another query just for id's but would like to know if there is a way to write in order to have it all calculate in one shot.

Thanks in advance!

Answer 1

SELECT  *
FROM    tableName
WHERE   ID IN 
        (
            SELECT ID 
            FROM   tableName
            WHERE  accounts = 7001
        )

• SQLFiddle Demo

The JOIN version ( recommended )

SELECT  a.*
FROM    students a
        INNER JOIN students b
          ON a.ID = b.ID
WHERE   b.accounts = 7001

• SQLFiddle Demo

Answer 2

select t2.*
from tbl t1, tbl t2
where t1.accounts = '7001'
and t1.id = t2.id

Answer 3

This solution is optimized:

SELECT  a.*
FROM    tableName as a
INNER JOIN tableName as b
    ON a.id = b.id
    AND b.accounts = 7001