DATE()

Description

Extracts the date part of the date or datetime expression expr.

Syntax

  1. > DATE(expr)

Arguments

ArgumentsDescription
exprRequired. The date/datetime to extract the date from.

Examples

  1. > drop table if exists t1;
  2. > create table t1(a date, b datetime);
  3. > insert into t1 values('2022-01-01','2022-01-01 01:01:01');
  4. > insert into t1 values('2022-01-01','2022-01-01 01:01:01');
  5. > insert into t1 values(20220101,'2022-01-01 01:01:01');
  6. > insert into t1 values('2022-01-02','2022-01-02 23:01:01');
  7. > insert into t1 values('2021-12-31','2021-12-30 23:59:59');
  8. > insert into t1 values('2022-06-30','2021-12-30 23:59:59');
  9. > select date(a),date(b) from t1;
  10. +------------+------------+
  11. | date(a)    | date(b)    |
  12. +------------+------------+
  13. | 2022-01-01 | 2022-01-01 |
  14. | 2022-01-01 | 2022-01-01 |
  15. | 2022-01-01 | 2022-01-01 |
  16. | 2022-01-02 | 2022-01-02 |
  17. | 2021-12-31 | 2021-12-30 |
  18. | 2022-06-30 | 2021-12-30 |
  19. +------------+------------+
  20. > select date(a),date(date(a)) as dda from t1;
  21. +------------+------------+
  22. | date(a)    | dda        |
  23. +------------+------------+
  24. | 2022-01-01 | 2022-01-01 |
  25. | 2022-01-01 | 2022-01-01 |
  26. | 2022-01-01 | 2022-01-01 |
  27. | 2022-01-02 | 2022-01-02 |
  28. | 2021-12-31 | 2021-12-31 |
  29. | 2022-06-30 | 2022-06-30 |
  30. +------------+------------+

Constraints

The date type supports only yyyy-mm-dd and yyyymmdd for now.

Currently, MatrixOne doesn’t support select function() without from tables.