Create constant value in subquery : Sub query « Select Clause « SQL / MySQL






  1. SQL / MySQL
  2. Select Clause
  3. Sub query

Create constant value in subquery

       
mysql>
mysql> SELECT   NUMBER AS SQUARE, ROUND(SQRT(NUMBER)) AS BASIS
    -> FROM    (SELECT    CAST(CONCAT(DIGIT1.DIGIT,
    ->                    CONCAT(DIGIT2.DIGIT,
    ->                    DIGIT3.DIGIT)) AS UNSIGNED INTEGER)
    ->                    AS NUMBER
    ->          FROM     (SELECT '0' AS DIGIT UNION SELECT '1' UNION
    ->                    SELECT '2' UNION SELECT '3' UNION
    ->                    SELECT '8' UNION SELECT '9') AS DIGIT1,
    ->                   (SELECT '0' AS DIGIT UNION SELECT '1' UNION
    ->                    SELECT '2' UNION SELECT '3' UNION
    ->                    SELECT '8' UNION SELECT '9') AS DIGIT2,
    ->                   (SELECT '0' AS DIGIT UNION SELECT '1' UNION
    ->                    SELECT '2' UNION SELECT '3' UNION
    ->                    SELECT '8' UNION SELECT '9') AS DIGIT3)
    ->                    AS NUMBERS
    -> WHERE    SQRT(NUMBER) = ROUND(SQRT(NUMBER))
    -> ORDER BY NUMBER;
+--------+-------+
| SQUARE | BASIS |
+--------+-------+
|      0 |     0 |
|      1 |     1 |
|      9 |     3 |
|     81 |     9 |
|    100 |    10 |
|    121 |    11 |
|    289 |    17 |
|    900 |    30 |
+--------+-------+
8 rows in set (0.00 sec)

mysql>








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