Exclude rows based on other rows (SQL)

问题

Say I have a query like this:

SELECT *
FROM TABLE

And it returns this:

TABLE
ID | DATA | VAL
===============
01 | ABCD | 1
01 | DEFG | 2
02 | FGHI | 3
02 | HIJK | 2
03 | JKLM | 3
03 | LMNO | 4
04 | NOPQ | 0
04 | PQRS | 1

Currently I have a query that attempts find only good values like this, but it's flawed because IDs that have bad VALs in other rows are included, which is not what I'd like.

SELECT *
FROM TABLE
WHERE TABLE.VAL IN ("1","2","3")

would return this (with LMNO and PQRS missing):

TABLE
ID | DATA | VAL
===============
01 | ABCD | 1
01 | DEFG | 2
02 | FGHI | 3
02 | HIJK | 2
03 | JKLM | 3
04 | NOPQ | 0

However, I only want rows where the ID has NO bad values. So, 01 and 02 are fine because all of their rows have good results. 03 and 04 are bad because they're tainted by the bad results in other rows.

I could just bring the result in like this and process it that way in software, but it seems as though this should be possible with a database, and as a general rule, doing it on the database is better than in software (you know, that's kind of what they're there for...)

The best I could come up with is this:

SELECT *
FROM TABLE
WHERE COUNT( SELECT ID
             FROM TABLE
             WHERE TABLE.VAL NOT IN ("1","2","3")
           ) = 0

Is this viable? Is there a better alternative?

Thanks!

回答1:

Use:

SELECT * 
  FROM TABLE a
 WHERE a.val IN (1,2,3)
   AND NOT EXISTS(SELECT NULL
                    FROM TABLE b
                   WHERE b.id = a.id
                     AND b.val NOT IN (1, 2, 3))

回答2:

you could use a minus operator.

pseudo-query

select everything
from tables
where id in ( select id from table minus select id from table where val is bad )

回答3:

you could try something like

SELECT *
FROM TABLE
WHERE TABLE.ID NOT IN(
    SELECT ID
    FROM TABLE
    WHERE TABLE.VAL < '1'
    OR TABLE.VAL > '3'
)

回答4:

Here is another alternative that will pass through TBL once, aggregate, and using the IDs found, retrieve the data from TBL

SELECT *
WHERE ID IN
(
    SELECT
       ID,
       CASE WHEN val in (1,2,3) THEN 1 ELSE 0 END Test
    FROM TBL
    GROUP BY ID
    HAVING MIN(val) = 1
)

For multi-column keys, and as an alternative to the above IN form, you can use the JOIN form.

SELECT T.*
FROM (
    SELECT
       Company, OrderNumber,
       CASE WHEN val in (1,2,3) THEN 1 ELSE 0 END Test
    FROM TBL
    GROUP BY Company, OrderNumber
    HAVING MIN(val) = 1
    ) KEEP
INNER JOIN TBL T ON T.Company = KEEP.Company and T.OrderNumber=KEEP.OrderNumber

来源：https://stackoverflow.com/questions/4823353/exclude-rows-based-on-other-rows-sql

标签

sql

progress-db