Select values that begin with a number

Question

I have a table with a column containing data that begin with numbers too, on MySQL

How can I select the rows that begin only with a number?

Answer 1

SELECT * FROM YourTable WHERE YourColumn regexp '^[0-9]+'

Answer 2

You can do:

SELECT *
FROM MyTable
WHERE MyColumn REGEXP '^[0-9]';

The regular expression used is ^[0-9].

^    - Start anchor, used to ensure the pattern matches start of the string.
[    - Start of character class.
0-9  - Any digit
]    - End of character class

Effectively we are trying to select those values in the column that begin with a digit.

Demo:

mysql> select * from tab;
+-------+
| col   |
+-------+
| 1foo  |
| foo   |
| 10foo |
| foo10 |
+-------+
4 rows in set (0.00 sec)

mysql> select * from tab where col regexp '^[0-9]';
+-------+
| col   |
+-------+
| 1foo  |
| 10foo |
+-------+
2 rows in set (0.00 sec)

Answer 3

Yet another way:

WHERE LEFT(columnName,1) IN ('0','1','2','3','4','5','6','7','8','9')

and with common charsets and collations, this would work and use an index on the column:

WHERE columnName >= '0' AND columnName < ':'

Answer 4

also

SELECT * FROM YourTable
WHERE YourColumn LIKE '[0-9]%';

Answer 5

SELECT * FROM TABLE T
WHERE T.COLUMNNAME REGEXP '^[0-9]';

Another answer is:

SELECT * FROM TABLE T
WHERE T.COLUMNNAME RLIKE '^[0-9]';