strleft

Description

Syntax

VARCHAR STRLEFT (VARCHAR str, INT len)

It returns the left part of a string of specified length, length is char length not the byte size. Another alias for this function is left. If the function parameters contain a NULL value, the function will always return NULL. If the integer parameter is less than or equal to 0, it will return an empty value.

example

1. mysql> select strleft("Hello doris",5);
2. +------------------------+
3. | strleft('Hello doris', 5) |
4. +------------------------+
5. | Hello                  |
6. +------------------------+
7. mysql> select strleft("Hello doris",-5);
8. +----------------------------+
9. | strleft('Hello doris', -5) |
10. +----------------------------+
11. |                            |
12. +----------------------------+
13. mysql> select strleft("Hello doris",NULL);
14. +------------------------------+
15. | strleft('Hello doris', NULL) |
16. +------------------------------+
17. | NULL                         |
18. +------------------------------+
19. mysql> select strleft(NULL,3);
20. +------------------+
21. | strleft(NULL, 3) |
22. +------------------+
23. | NULL             |
24. +------------------+

keywords

1. STRLEFT, LEFT