CAST()
This page is part of MariaDB's Enterprise Documentation.
The parent of this page is: Functions
Topics on this page:
Overview
Takes a value of one type and converts it to the value of another of type. See CONVERT.
See also: Functions in 10.6 ES, in 10.6 CS, in 10.5 ES, in 10.5 CS, in 10.4 ES, in 10.4 CS, in 10.3 ES, in 10.3 CS, in 10.2 ES, and in 10.2 CS
EXAMPLES
CREATE TABLE cast_example (
example VARCHAR(32)
);
INSERT INTO cast_example VALUES
('apple '), ('Apricot '), ('berry'),
('Cheese '), ('Dairy '), ('eggs ');
Notice that casing a VARCHAR to a CHAR does not auto-remove the trailing spaces (since the space removal only happens when a value is retrieved from a field):
SELECT example, LENGTH(example), LENGTH(CAST(example AS CHAR))
FROM cast_example ORDER BY example;
+-----------+-----------------+-------------------------------+
| example | LENGTH(example) | LENGTH(CAST(example AS CHAR)) |
+-----------+-----------------+-------------------------------+
| apple | 6 | 6 |
| Apricot | 9 | 9 |
| berry | 5 | 5 |
| Cheese | 9 | 9 |
| Dairy | 7 | 7 |
| eggs | 5 | 5 |
+-----------+-----------------+-------------------------------+
You can make case significant in a sort by casting to a BINARY type:
SELECT * FROM cast_example ORDER BY CAST(example AS BINARY);
+-----------+
| example |
+-----------+
| Apricot |
| Cheese |
| Dairy |
| apple |
| berry |
| eggs |
+-----------+
CREATE TABLE timezone (t TIMESTAMP);
INSERT INTO timezone VALUES ('2020-10-13T23:23:28');
SELECT CAST(t AS DATETIME) FROM timezone;
+---------------------+
| CAST(t AS DATETIME) |
+---------------------+
| 2020-10-13 23:23:28 |
+---------------------+
CHANGE HISTORY
Release Series | History |
---|---|
10.6 Enterprise |
|
10.6 Community |
|
10.5 Enterprise |
|
10.5 Community |
|
10.4 Enterprise |
|
10.4 Community |
|
10.3 Enterprise |
|
10.3 Community |
|
10.2 Enterprise |
|
10.2 Community |
|
EXTERNAL REFERENCES
Additional information on this topic may be found in the MariaDB Public Knowledge Base.
Information specific to MariaDB SkySQL can be found on the CAST() page in the SkySQL Documentation.