Union constant values : Union « Select Clause « SQL / MySQL






  1. SQL / MySQL
  2. Select Clause
  3. Union

Union constant values

   
mysql>
mysql>
mysql> SELECT   LETTER1 || LETTER2 || LETTER3
    -> FROM    (SELECT 'a' AS LETTER1 UNION SELECT 'b'
    ->          UNION SELECT 'c' UNION SELECT 'd') AS LETTERS1,
    ->         (SELECT 'a' AS LETTER2 UNION SELECT 'b'
    ->          UNION SELECT 'c' UNION SELECT 'd') AS LETTERS2,
    ->         (SELECT 'a' AS LETTER3 UNION SELECT 'b'
    ->          UNION SELECT 'c' UNION SELECT 'd') AS LETTERS3;
+-------------------------------+
| LETTER1 || LETTER2 || LETTER3 |
+-------------------------------+
|                             0 |
|                             0 |
|                             0 |
|                             0 |
|                             0 |
|                             0 |
|                             0 |
|                             0 |
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|                             0 |
|                             0 |
|                             0 |
|                             0 |
+-------------------------------+
64 rows in set (0.00 sec)

mysql>








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20.Limit then union
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26.Create view for union
27.Create view for union constants
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