how to remove characters from a string in sqlite3 database?

问题

i have a string like this a) Text in my sqlite databse..i want to remove a) from databse..anyone know a query for this?

回答1:

@laalto's answer is close, but it will not work on edge cases, specifically if 'a) ' occurs elsewhere in the string. You want to use SUBSTR to only remove the first 3 characters.

sqlite> SELECT REPLACE ("a) I have some information (or data) in the file.", "a) ", "");
I have some information (or datin the file.

sqlite> SELECT SUBSTR ("a) I have some information (or data) in the file.", 4);
I have some information (or data) in the file.

So updating his query, it should turn into:

UPDATE tbl SET col=SUBSTR(col, 4) WHERE col LIKE 'a) %';

... noting that strings are indexed from 1 in SQLite.

回答2:

You can use REPLACE also to delete parts of a string:

UPDATE tbl SET col=REPLACE(col, 'a) ', '') WHERE col LIKE 'a) %';

回答3:

I think this code help you.

UPDATE TABLE_NAME SET COLUMN_NAME=REPLACE(COLUMN_NAME,'xxx','') WHERE COLUMN_NAME LIKE 'xxx%;

from the above code 'xxx' your unwanted string that is replaced '' when the string starts with xxx all of the row in the column that you will be chosen.

来源：https://stackoverflow.com/questions/1266606/how-to-remove-characters-from-a-string-in-sqlite3-database