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add str_to_date #970
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docs/MatrixOne/Reference/Functions-and-Operators/Datetime/str-to-date.md
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# **STR_TO_DATE()** | ||
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## **函数说明** | ||
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`STR_TO_DATE()` 函数按照指定日期或时间显示格式,将字符串转换为日期或日期时间类型,与 [`TO_DATE()`](to-date.md) 同义。 | ||
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格式字符串可以包含文字字符和以%开头的格式说明符。format 中的字面字符与格式说明符必须与 str 匹配,支持表达式。如果不能按照 format 解析 str 或者其中任何一个参数为 NULL,`STR_TO_DATE` 函数将返回 NULL。 | ||
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有关可以使用的格式说明符,请参阅 [`DATE_FORMAT()`](date-format.md) 函数描述。 | ||
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## **函数语法** | ||
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``` | ||
> STR_TO_DATE(str,format) | ||
``` | ||
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## **参数释义** | ||
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| 参数 | 说明 | | ||
| ---- | ---- | | ||
| str | 要格式化为日期的字符串 (输入字符串) | | ||
| format | 要使用的格式字符串 | | ||
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## **示例** | ||
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```sql | ||
mysql> SELECT STR_TO_DATE('2022-01-06 10:20:30','%Y-%m-%d %H:%i:%s') as result; | ||
+---------------------+ | ||
| result | | ||
+---------------------+ | ||
| 2022-01-06 10:20:30 | | ||
+---------------------+ | ||
1 row in set (0.00 sec) | ||
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mysql> SELECT STR_TO_DATE('09:30:17','%h:%i:%s'); | ||
+---------------------------------+ | ||
| str_to_date(09:30:17, %h:%i:%s) | | ||
+---------------------------------+ | ||
| 09:30:17 | | ||
+---------------------------------+ | ||
1 row in set (0.00 sec) | ||
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-- format 参数支持表达式 | ||
mysql> SELECT str_to_date('2008-01-01',replace('yyyy-MM-dd','yyyy-MM-dd','%Y-%m-%d')) as result; | ||
+------------+ | ||
| result | | ||
+------------+ | ||
| 2008-01-01 | | ||
+------------+ | ||
1 row in set (0.00 sec) | ||
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--STR_TO_DATE 函数在根据格式字符串 format 解析输入字符串 str 时,忽略输入字符串 str 末尾的额外字符 | ||
mysql> SELECT STR_TO_DATE('25,5,2022 extra characters','%d,%m,%Y'); | ||
+---------------------------------------------------+ | ||
| str_to_date(25,5,2022 extra characters, %d,%m,%Y) | | ||
+---------------------------------------------------+ | ||
| 2022-05-25 | | ||
+---------------------------------------------------+ | ||
1 row in set (0.00 sec) | ||
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mysql> SELECT STR_TO_DATE('2022','%Y'); | ||
+-----------------------+ | ||
| str_to_date(2022, %Y) | | ||
+-----------------------+ | ||
| NULL | | ||
+----------------------- | ||
``` |
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补充下to_date是str_to_date的别名。