I have a vertical table like this:
id | Profile_id | feature_id | value |
---|---|---|---|
1 | 1 | 1 | Rick |
2 | 1 | 2 | Novak |
3 | 5 | 3 | 5428 |
4 | 5 | 1 | Joe |
... | ... | ... | ... |
(above table is short part of profile_features table)
I have a query:
SELECT * FROM(SELECT `value` TelNum FROM `profile_features` WHERE `feature_id` IN (10, 64, 103) AND `profile_id` = 16752 LIMIT 1) as TelNum,
(SELECT `value` NCode From `profile_features` WHERE `feature_id` IN (5, 61, 100) AND `profile_id` = 16752 LIMIT 1) AS NCode,
(SELECT `value` Fname From `profile_features` WHERE `feature_id` IN (1, 55, 86) AND `profile_id` = 16752 LIMIT 1) AS Fname,
(SELECT `value` Lname From `profile_features` WHERE `feature_id` IN (2, 56, 95) AND `profile_id` = 16752 LIMIT 1) AS Lname
but if one of the subqueries returns null, query have not any output.
I want a row result with TelNum, NCode, Fname, Lname either they are Null or not null.
You could use scalar subqueries in the select-list instead of your current Cartesian product:
SELECT (SELECT `value` FROM `profile_features` WHERE `feature_id` IN (10, 64, 103) AND `profile_id` = 16752 LIMIT 1) as TelNum,
(SELECT `value` From `profile_features` WHERE `feature_id` IN (5, 61, 100) AND `profile_id` = 16752 LIMIT 1) AS NCode,
(SELECT `value` From `profile_features` WHERE `feature_id` IN (1, 55, 86) AND `profile_id` = 16752 LIMIT 1) AS Fname,
(SELECT `value` From `profile_features` WHERE `feature_id` IN (2, 56, 95) AND `profile_id` = 16752 LIMIT 1) AS Lname;
Alternatively, you could learn to use LEFT OUTER JOIN:
SELECT TelNum.TelNum, NCode.NCode, Fname.Fname, Lname.Lname
FROM (SELECT NULL AS dummy) AS dummy
LEFT OUTER JOIN (SELECT `value` TelNum FROM `profile_features` WHERE `feature_id` IN (10, 64, 103) AND `profile_id` = 16752 LIMIT 1) AS TelNum ON true
LEFT OUTER JOIN (SELECT `value` NCode From `profile_features` WHERE `feature_id` IN (5, 61, 100) AND `profile_id` = 16752 LIMIT 1) AS NCode ON true
LEFT OUTER JOIN (SELECT `value` Fname From `profile_features` WHERE `feature_id` IN (1, 55, 86) AND `profile_id` = 16752 LIMIT 1) AS Fname ON true
LEFT OUTER JOIN (SELECT `value` Lname From `profile_features` WHERE `feature_id` IN (2, 56, 95) AND `profile_id` = 16752 LIMIT 1) AS Lname ON true;
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