如何在MySQL中删除左一个字符和右一个字符

我有一个时区列，它给出了来自国家/地区的时区。我想从字符串中删除括号，这在sql中是可能的

字符串就像

(GMT)

我想要

GMT

---

有谁能给我一个主意吗？

如果你想删除

选择
语句中的前后括号

挑选
使用
SUBSTR
：

SET @str := '(GMT)';

SELECT 
REPLACE(REPLACE(@str,')',''),'(','');

SET @str := '(GMT)';

SELECT 
TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM @str));

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = SUBSTR(YOUR_COLUMN FROM 2 FOR LENGTH(YOUR_COLUMN) - 2);

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = REPLACE(REPLACE(YOUR_COLUMN,')',''),'(','');

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM YOUR_COLUMN));

SET@str:='（GMT）'

或

使用
替换
：

SET @str := '(GMT)';

SELECT 
REPLACE(REPLACE(@str,')',''),'(','');

SET @str := '(GMT)';

SELECT 
TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM @str));

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = SUBSTR(YOUR_COLUMN FROM 2 FOR LENGTH(YOUR_COLUMN) - 2);

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = REPLACE(REPLACE(YOUR_COLUMN,')',''),'(','');

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM YOUR_COLUMN));

或：

SET @str := '(GMT)';

SELECT 
REPLACE(REPLACE(@str,')',''),'(','');

SET @str := '(GMT)';

SELECT 
TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM @str));

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = SUBSTR(YOUR_COLUMN FROM 2 FOR LENGTH(YOUR_COLUMN) - 2);

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = REPLACE(REPLACE(YOUR_COLUMN,')',''),'(','');

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM YOUR_COLUMN));

使用
修剪
：

SET @str := '(GMT)';

SELECT 
REPLACE(REPLACE(@str,')',''),'(','');

SET @str := '(GMT)';

SELECT 
TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM @str));

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = SUBSTR(YOUR_COLUMN FROM 2 FOR LENGTH(YOUR_COLUMN) - 2);

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = REPLACE(REPLACE(YOUR_COLUMN,')',''),'(','');

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM YOUR_COLUMN));

注意：在使用
选择时必须输入表名。像这样：

SELECT 
    TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM YOUR_COLUMN NAME)) FROM YOUR_TABLE;



更新
如果要更新表中的相应列，请执行以下操作：

使用
SUBSTR
：

SET @str := '(GMT)';

SELECT 
REPLACE(REPLACE(@str,')',''),'(','');

SET @str := '(GMT)';

SELECT 
TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM @str));

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = SUBSTR(YOUR_COLUMN FROM 2 FOR LENGTH(YOUR_COLUMN) - 2);

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = REPLACE(REPLACE(YOUR_COLUMN,')',''),'(','');

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM YOUR_COLUMN));

使用
替换
：

SET @str := '(GMT)';

SELECT 
REPLACE(REPLACE(@str,')',''),'(','');

SET @str := '(GMT)';

SELECT 
TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM @str));

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = SUBSTR(YOUR_COLUMN FROM 2 FOR LENGTH(YOUR_COLUMN) - 2);

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = REPLACE(REPLACE(YOUR_COLUMN,')',''),'(','');

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM YOUR_COLUMN));

使用
修剪
：

SET @str := '(GMT)';

SELECT 
REPLACE(REPLACE(@str,')',''),'(','');

SET @str := '(GMT)';

SELECT 
TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM @str));

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = SUBSTR(YOUR_COLUMN FROM 2 FOR LENGTH(YOUR_COLUMN) - 2);

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = REPLACE(REPLACE(YOUR_COLUMN,')',''),'(','');

UPDATE 
YOUR_TABLE
SET YOUR_COLUMN = TRIM(TRAILING ')' FROM TRIM(LEADING '(' FROM YOUR_COLUMN));

检查

是否要
更新
或
选择
？如果只有一组括号，也可以将它们替换掉。选择替换（替换（替换（公共时区“）”，”，”，（”，”）；当我输入列名而不是字符串变量时，出现未知表错误。请检查一下……您必须把您的表名放在那里。像这样
从您的_表中选择REPLACE（REPLACE（Common_TimeZone.Zone，），，，，（，）；请检查我答案中的注释。有没有否决投票的原因？我很想听到你（无论谁投了反对票）。