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MysqlのソートでNULLや0を最後に並べる方法

Last updated at Posted at 2019-10-26

前置き

Mysqlでは、
シンプルにソートを行うと、
0NULLは先に並べられてしまいます。

SQL

SELECT *
FROM tests
ORDER BY
    rank ASC;
NULL->0->1~の順番になってしまう
+----+------+
| id | rank |
+----+------+
|  4 | NULL |
|  3 |    0 |
|  1 |    1 |
|  2 |    2 |
+----+------+

以下の方法で、NULLや0を最後に並べられるので、ぜひ使ってみてください!

NULL を最後に並べたい場合

SQL

SELECT *
FROM tests
ORDER BY
    rank IS NULL ASC, /* 追加 */
    rank ASC;
0->1~->NULLの順番になる
+----+------+
| id | rank |
+----+------+
|  3 |    0 |
|  1 |    1 |
|  2 |    2 |
|  4 | NULL |
+----+------+

NULL と 0 を最後に並べたい場合

SQL

SELECT *
FROM tests
ORDER BY
    rank IS NULL ASC, /* 追加 */
    rank = 0 ASC, /* 追加 */
    rank ASC;
1~->0&NULLの順番になる
+----+------+
| id | rank |
+----+------+
|  1 |    1 |
|  2 |    2 |
|  3 |    0 |
|  4 | NULL |
+----+------+
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