如何從 MySQL 字串中提取日期?
要從 MySQL 中的字串中提取日期,請使用 SUBSTRING_INDEX()。我們先建立一個表 -
mysql> create table DemoTable -> ( -> Title text -> ); Query OK, 0 rows affected (0.58 sec)
使用插入命令在表中插入一些記錄 -
mysql> insert into DemoTable values('John has got joining date.12/31/2018'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('Carol has got joining date.01/11/2019'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values('Sam will arrive at.12/03/2050'); Query OK, 1 row affected (0.87 sec)
使用選擇語句顯示錶中的所有記錄 -
mysql> select *from DemoTable;
這將產生以下輸出 -
+---------------------------------------+ | Title | +---------------------------------------+ | John has got joining date.12/31/2018 | | Carol has got joining date.01/11/2019 | | Sam will arrive at.12/03/2050 | +---------------------------------------+ 3 rows in set (0.00 sec)
以下是從 MySQL 中的字串中提取日期的查詢 -
mysql> select substring_index(substring_index(Title,".", -1), ".", 1) from DemoTable;
這將產生以下輸出 -
+----------------------------------------------------------+ | substring_index(substring_index(Title,".", -1), ".", 1) | +----------------------------------------------------------+ | 12/31/2018 | | 01/11/2019 | | 12/03/2050 | +----------------------------------------------------------+ 3 rows in set (0.00 sec)
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