concat_ws

Description

Syntax

VARCHAR concat_ws (VARCHAR sep, VARCHAR str,...) VARCHAR concat_ws(VARCHAR sep, ARRAY array)

Using the first parameter SEP as a connector, the second parameter and all subsequent parameters(or all string in an ARRAY) are spliced into a string. If the separator is NULL, return NULL. The concat_ws function does not skip empty strings, it skips 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. +---------------------------------+
  22. mysql> select concat_ws("or", ["d", "is"]);
  23. +-----------------------------------+
  24. | concat_ws('or', ARRAY('d', 'is')) |
  25. +-----------------------------------+
  26. | doris                             |
  27. +-----------------------------------+
  29. mysql> select concat_ws(NULL, ["d", "is"]);
  30. +-----------------------------------+
  31. | concat_ws(NULL, ARRAY('d', 'is')) |
  32. +-----------------------------------+
  33. | NULL                              |
  34. +-----------------------------------+
  36. mysql> select concat_ws("or", ["d", NULL,"is"]);
  37. +-----------------------------------------+
  38. | concat_ws('or', ARRAY('d', NULL, 'is')) |
  39. +-----------------------------------------+
  40. | doris                                   |
  41. +-----------------------------------------+

keywords

  1. CONCAT_WS,CONCAT,WS,ARRAY