MySQL中如何取得指定字串的長度？

MySQL 中的 CHAR_LENGTH() 或 CHARACTER_LENGTH() 字串函式用於擷取指定字串的長度。此函數只會計算字元數，而忽略字元是單字節還是多位元組。

範例

mysql> Select CHAR_LENGTH('New Delhi');
+--------------------------+
| CHAR_LENGTH('New Delhi') |
+--------------------------+
| 9                        |
+--------------------------+
1 row in set (0.00 sec)

mysql> Select CHAR_LENGTH('NewDelhi');
+-------------------------+
| CHAR_LENGTH('NewDelhi') |
+-------------------------+
| 8                       |
+-------------------------+
1 row in set (0.00 sec)

mysql> Select CHARACTER_LENGTH('NewDelhi');
+------------------------------+
| CHARACTER_LENGTH('NewDelhi') |
+------------------------------+
| 8                            |
+------------------------------+
1 row in set (0.00 sec)

mysql> Select CHARACTER_LENGTH('New Delhi');
+-------------------------------+
| CHARACTER_LENGTH('New Delhi') |
+-------------------------------+
| 9                             |
+-------------------------------+
1 row in set (0.00 sec)

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