从MySql中的字段值的开头删除字符

Question

I have about 2000 records in a MySql table. a specific field in some of them starts with colon character (:) that is not needed. I have to remove this character from the beginning of it.

How can I do that ? Should I use regular expression ?

Answer 1

you can remove the first character using SUBSTR function. Like

UPDATE tableName SET field = SUBSTR(field, 2) WHERE field LIKE ':%';

or you can use regex also, to match beginning character ( ^ ) of the word. Here is the link for how to use regex .

Answer 2

UPDATE tableName
SET columnName = REPLACE(columnName, ':', '')
WHERE columnName LIKE ':%'

• SQLFiddle Demo

Answer 3

you could do something like:

UPDATE TABLE
SET FIELD = SUBST(FIELD,1)
WHERE LEFT(FIELD,1) = ':'