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lines changed Original file line number Diff line number Diff line change 22title : 比较运算符
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5- | 运算符 | 描述 | 示例 | 结果 |
6- | --------------- | ------------------------------------------- | -- ------------------------- | ------ |
7- | ** = ** | a 等于 b | ** 2 = 2** | TRUE |
8- | ** != ** | a 不等于 b | ** 2 != 3** | TRUE |
9- | ` ** <\>** ` | a 不等于 b | ` ** 2 <\> 2** ` | FALSE |
10- | ** > ** | a 大于 b | ** 2 > 3** | FALSE |
11- | ** >= ** | a 大于或等于 b | ** 4 >= NULL** | NULL |
12- | ` **<** ` | a 小于 b | ` ** 2 < 3** ` | TRUE |
13- | ` **<=** ` | a 小于或等于 b | ` ** 2 <= 3** ` | TRUE |
14- | ** IS NULL** | 如果表达式为 NULL, 则为 TRUE,否则为 FALSE | ** (4 >= NULL) IS NULL** | TRUE |
15- | ** IS NOT NULL** | 如果表达式为 NULL, 则为 FALSE,否则为 TRUE | ** (4 >= NULL) IS NOT NULL** | FALSE |
5+ | 运算符 | 描述 | 示例 | 结果 |
6+ | ------------- | ------------------------------------------ | ------------------------- | ------ |
7+ | ` = ` | a 等于 b | ` 2 = 2 ` | TRUE |
8+ | ` != ` | a 不等于 b | ` 2 != 3 ` | TRUE |
9+ | ` <\> ` | a 不等于 b | ` 2 <\> 2 ` | FALSE |
10+ | ` > ` | a 大于 b | ` 2 > 3 ` | FALSE |
11+ | ` >= ` | a 大于或等于 b | ` 4 >= NULL ` | NULL |
12+ | ` < ` | a 小于 b | ` 2 < 3 ` | TRUE |
13+ | ` <= ` | a 小于或等于 b | ` 2 <= 3 ` | TRUE |
14+ | ` IS NULL ` | 如果表达式为 NULL 则为 TRUE,否则为 FALSE | ` (4 >= NULL) IS NULL ` | TRUE |
15+ | ` IS NOT NULL ` | 如果表达式为 NULL 则为 FALSE,否则为 TRUE | ` (4 >= NULL) IS NOT NULL ` | FALSE |
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