Funzione MySQL CAST()

Converti un valore in un tipo di dati DATE:

SELECT CAST("2017-08-29" AS DATE);

Definizione e utilizzo

La funzione CAST() converte un valore (di qualsiasi tipo) nel tipo di dati specificato.

Suggerimento: vedere anche la funzione CONVERT() .

CAST(value AS datatype)

Parameter

Description

value

Required. The value to convert

datatype

Required. The datatype to convert to. Can be one of the following:

Value	Description
DATE	Converts value to DATE. Format: "YYYY-MM-DD"
DATETIME	Converts value to DATETIME. Format: "YYYY-MM-DD HH:MM:SS"
DECIMAL	Converts value to DECIMAL. Use the optional M and D parameters to specify the maximum number of digits (M) and the number of digits following the decimal point (D).
TIME	Converts value to TIME. Format: "HH:MM:SS"
CHAR	Converts value to CHAR (a fixed length string)
NCHAR	Converts value to NCHAR (like CHAR, but produces a string with the national character set)
SIGNED	Converts value to SIGNED (a signed 64-bit integer)
UNSIGNED	Converts value to UNSIGNED (an unsigned 64-bit integer)
BINARY	Converts value to BINARY (a binary string)

Funziona in:	Da MySQL 4.0

Converti un valore in un tipo di dati CHAR:

SELECT CAST(150 AS CHAR);

Converti un valore in un tipo di dati TIME:

SELECT CAST("14:06:10" AS TIME);

Converti un valore in un tipo di dati SIGNED:

SELECT CAST(5-10 AS SIGNED);