从 SQL 中删除零

Question

How can I delete the digit 0 in MySQL only for codes that have 7 digits?

Example:

• 0100396 (wipes 0 from the front)
• 010611 (will not be deleted)

Answer 1

If you want to view your data this way, use the following select:

SELECT IF(code REGEXP '^0[0-9]{6}$', RIGHT(code, 6), code) AS code
FROM yourTable;

If you want to update your table, then use this:

UPDATE yourTable
SET code = RIGHT(code, 6)
WHERE code REGEXP '^0[0-9]{6}$';

Note that this assumes that your code column is text, and not actually a number. In the latter case, there are no leading zeroes.

Answer 2

Try this:

update mytable 
set code=substring(code,2,7)
where length(code)=7 and substring(code,1,1)=0

Answer 3

This is a code, just put variable instead of hardcoded digits.

SELECT IF(LENGTH(0100396)=7, RIGHT(0100396, 6), 0100396);

Answer 4

update DemoTable set Value=substr(Value,2)

to remove 1st value from front

create table DemoTable (Value varchar(100));
insert into DemoTable values('83967364');
insert into DemoTable values('2345');
insert into DemoTable values('12345676');
select *from DemoTable;
select values FROM DemoTable
ORDER BY(CASE
WHEN LEN(values) > 6 THEN update DemoTable set Value=substr(Value,2)
ELSE values
END);
select *from DemoTable;