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  • mysql比较运算符和函数

    mysql> SELECT 15 BETWEEN 1 AND 22;
    +---------------------+
    | 15 BETWEEN 1 AND 22 |
    +---------------------+
    | 1 |
    +---------------------+
    1 row in set (0.00 sec)

    mysql>
    mysql> SELECT 22 BETWEEN 1 AND 22;
    +---------------------+
    | 22 BETWEEN 1 AND 22 |
    +---------------------+
    | 1 |
    +---------------------+
    1 row in set (0.00 sec)

    mysql> SELECT 32 BETWEEN 1 AND 22;
    +---------------------+
    | 32 BETWEEN 1 AND 22 |
    +---------------------+
    | 0 |
    +---------------------+
    1 row in set (0.00 sec)

    mysql> SELECT 32 NOT BETWEEN 1 AND 22;
    +-------------------------+
    | 32 NOT BETWEEN 1 AND 22 |
    +-------------------------+
    | 1 |
    +-------------------------+
    1 row in set (0.00 sec)

    mysql> SELECT 10 IN(5,10,15);
    +----------------+
    | 10 IN(5,10,15) |
    +----------------+
    | 1 |
    +----------------+
    1 row in set (0.03 sec)

    mysql> SELECT 13 IN(5,10,15);
    +----------------+
    | 13 IN(5,10,15) |
    +----------------+
    | 0 |
    +----------------+
    1 row in set (0.00 sec)

    mysql> SELECT NULL IS NULL;
    +--------------+
    | NULL IS NULL |
    +--------------+
    | 1 |
    +--------------+
    1 row in set (0.00 sec)

    mysql> SELECT '' IS NULL;
    +------------+
    | '' IS NULL |
    +------------+
    | 0 |
    +------------+
    1 row in set (0.00 sec)

    mysql> SELECT 0 IS NULL;
    +-----------+
    | 0 IS NULL |
    +-----------+
    | 0 |
    +-----------+
    1 row in set (0.00 sec)

    mysql> SELECT * FROM test;
    +----+----------+
    | id | username |
    +----+----------+
    | 1 | John |
    | 2 | Mary |
    | 3 | 1%Lily |
    | 4 | Rose |
    | 5 | NULL |
    +----+----------+
    5 rows in set (0.00 sec)

    mysql> SELECT * FROM test WHERE USERNAME IS NULL;
    +----+----------+
    | id | username |
    +----+----------+
    | 5 | NULL |
    +----+----------+

    mysql> SELECT * FROM test WHERE USERNAME IS NOT NULL;
    +----+----------+
    | id | username |
    +----+----------+
    | 1 | John |
    | 2 | Mary |
    | 3 | 1%Lily |
    | 4 | Rose |
    +----+----------+

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  • 原文地址:https://www.cnblogs.com/toudoubao/p/6636072.html
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