COERCIBILITY
Syntax
COERCIBILITY(str)
Description
Returns the collation coercibility value of the string argument. Coercibility defines what will be converted to what in case of collation conflict, with an expression with higher coercibility being converted to the collation of an expression with lower coercibility.
| Coercibility | Description | Example |
|---|---|---|
| 0 | Explicit | Value using a COLLATE clause |
| 1 | No collation | Concatenated strings using different collations |
| 2 | Implicit | A string data type column value, CAST to a string data type |
| 3 | System constant | DATABASE(), USER() return value |
| 4 | Coercible | Literal string |
| 5 | Numeric | Numeric and temporal values |
| 6 | Ignorable | NULL or derived from NULL |
Examples
SELECT COERCIBILITY('abc' COLLATE latin1_swedish_ci); +-----------------------------------------------+ | COERCIBILITY('abc' COLLATE latin1_swedish_ci) | +-----------------------------------------------+ | 0 | +-----------------------------------------------+ SELECT COERCIBILITY(CAST(1 AS CHAR)); +-------------------------------+ | COERCIBILITY(CAST(1 AS CHAR)) | +-------------------------------+ | 2 | +-------------------------------+ SELECT COERCIBILITY(USER()); +----------------------+ | COERCIBILITY(USER()) | +----------------------+ | 3 | +----------------------+ SELECT COERCIBILITY('abc'); +---------------------+ | COERCIBILITY('abc') | +---------------------+ | 4 | +---------------------+ SELECT COERCIBILITY(1); +-----------------+ | COERCIBILITY(1) | +-----------------+ | 5 | +-----------------+ SELECT COERCIBILITY(NULL); +--------------------+ | COERCIBILITY(NULL) | +--------------------+ | 6 | +--------------------+
Content reproduced on this site is the property of its respective owners,
and this content is not reviewed in advance by MariaDB. The views, information and opinions
expressed by this content do not necessarily represent those of MariaDB or any other party.
