拆分逗号分隔的字符串 -->FUNCTION db.CHARINDEX 不存在
我需要将逗号分隔的字符串拆分为第二列我有下表:
I need to split comma delimited string into a second columns I have the following table :
CL1 POS POS2 LENGHT ALLELE
1 3015108,3015109 5 A
2 3015110,3015200 10 B
3 3015200,3015300 15 C
4 3015450,3015500 20 D
5 3015600,3015700 15 E
我想将逗号后的数字拆分为第二列 POS2所以它应该喜欢
I want to split the numbers after the comma into a second column POS2 So it should like that
CL1 POS POS2 LENGHT ALLELE
1 3015108 3015109 5 A
2 3015110 3015200 10 B
3 3015200 3015300 15 C
4 3015450 3015500 20 D
5 3015600 3015700 15 E
所以我查询了以下内容:
So I've queried the following :
INSERT INTO MyTable (POS2)
SELECT RIGHT(POS, CHARINDEX(',', POS) + 1 ) FROM MyTable ;
It returns an error :
ERROR 1305 (42000): FUNCTION test.CHARINDEX does not exist
推荐答案
MySQL 没有内置的 CHARINDEX()
函数.LOCATE()
将是 MySQL等价.
MySQL doesn't have a built-in CHARINDEX()
function. LOCATE()
would be the MySQL equivalent.
使用SUBSTRING_INDEX()
可能是一种更简洁的方法.像这样的东西(免责声明:未经测试):
Using SUBSTRING_INDEX()
might be a more succinct way of doing this. Something like this (disclaimer: untested):
SUBSTRING_INDEX(POS, ',', 1)
用于 POS
SUBSTRING_INDEX(POS, ',', -1)
用于 POS2
顺便说一句,我可能误解了您要完成的任务,但您似乎想要UPDATE
现有行,而不是 INSERT
新行?类似的东西:
As an aside, I may be misunderstanding what you're trying to accomplish, but it looks like you might want to UPDATE
existing rows, not INSERT
new ones? Something like:
UPDATE MyTable SET POS2 = SUBSTRING_INDEX(POS, ',', -1);
UPDATE MyTable SET POS = SUBSTRING_INDEX(POS, ',', 1);
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