Question

How to replace first 44 digits to 0 in MySQL?

For example:

4476384424131 to 076384424131

Answer 1

Using character types and substring functions, you can simply cut off the initial ’44’ and replace it with a zero concatenated back on.

UPDATE tbl
  SET num = CONCAT('0', SUBSTR(num, 3))
WHERE LEFT(num, 2) = '44'

(Edit: fixed the WHERE clause to use LEFT() instead of SUBSTR())

mysql> SELECT CONCAT('0', SUBSTR(4476384424131, 3));
+-----------------------------------------+
| CONCAT('0', SUBSTR(4476384424131, 3))   |
+-----------------------------------------+
| 076384424131                            |
+-----------------------------------------+