Concat_ws

Description

Syntax

‘VARCHAR concat ws (VARCHAR sep., VARCHAR str,…)’

Using the first parameter SEP as a connector, the second parameter and all subsequent parameters are spliced into a string. If the separator is NULL, return NULL. The concat_ws function does not skip empty strings, but NULL values.

example

  1. mysql> select concat_ws("or", "d", "is");
  2. +----------------------------+
  3. | concat_ws('or', 'd', 'is') |
  4. +----------------------------+
  5. | doris                      |
  6. +----------------------------+
  8. mysql> select concat_ws(NULL, "d", "is");
  9. +----------------------------+
  10. | concat_ws(NULL, 'd', 'is') |
  11. +----------------------------+
  12. | NULL                       |
  13. +----------------------------+
  15. mysql> select concat_ws("or", "d", NULL,"is");
  16. +---------------------------------+
  17. | concat_ws("or", "d", NULL,"is") |
  18. +---------------------------------+
  19. | doris                           |
  20. +---------------------------------+

keyword

CONCAT_WS,CONCAT,WS