Use sequential CASEs as parameters for larger CASE - mysql

Question

SELECT CASE
WHEN
CASE
WHEN `AA`>6
THEN `A`
ELSE NULL
END,
CASE
WHEN `BB`>6
THEN `B`
ELSE NULL
END,
CASE
WHEN `CC`>6
THEN `C`
ELSE NULL
END
THEN `NAME`
END
FROM TABLE;
The goal of this query is to show the columns A through C and Name. but if A-C is null to not show NAME.
I'm new to CASEs and 'advanced' queries in general, so if I have this set up like a fool, feel free to let me know.
Thanks for reading.
NOTE: doesn't compile
The logic I'm trying to get is so:
if(
if(AA>6) then 1 else 0
OR
if(BB>6) then 1 else 0
OR
if(CC>6) then 1 else 0
etc,etc
) then 1 else 0
Table:
Name A B C AA BB cc
--------------------------------------------------------
Name1 Data1 null Data3 3 n 15
Name2 null Data2 Data4 n 2 8
Name3 null Data2 Data4 n 2 2
Output wanted if it's only showing values gt 6:
Name A B C
-------------------------
Name1 Data3
Name2 Data4

Answer 1

One way to do it
SELECT Name,
CASE WHEN aa > 6 THEN a END a,
CASE WHEN bb > 6 THEN b END b,
CASE WHEN cc > 6 THEN c END c
FROM table1
WHERE aa > 6
OR bb > 6
OR cc > 6
or
SELECT Name,
CASE WHEN aa > 6 THEN a END a,
CASE WHEN bb > 6 THEN b END b,
CASE WHEN cc > 6 THEN c END c
FROM table1
HAVING COALESCE(a, b, c, -1) <> -1
In the second query -1 is just a constant that will be returned if all of your columns have NULL values. You can use any value that will never be a part of your result set. In this particular case since you're applying column > 6 condition to every column you can use any number that is less than 6.
Output:
| NAME | A | B | C |
-----------------------------------
| Name1 | (null) | (null) | Data3 |
| Name2 | (null) | (null) | Data4 |
Here is SQLFiddle demo