BINARY also causes trailing spaces to be significant. This causes the comparison to be case sensitive even if the column isn't defined as BINARY or BLOB. This is an easy way to force a column comparison to be done byte by byte rather than character by character. It casts a string following it to a binary string.īINARY str is shorthand for CAST( str AS BINARY) Using CAST() function is the same as using CONVERT() function except that it uses keyword AS in betweenīINARY is an operator rather than function. In MySQL, transcoding names are the same as the corresponding character set names. In this form, CONVERT() with USING is used to convert data between different character sets (utf8, latin1. See Practice #1-5.Ĭonverts an unsigned integer to a signed integer.įor an example of a practical use, read Tip #2 in How to enforce data type constraint article.Ĭonverts a signed integer to an unsigned integer.įorm 2: CONVERT( expr USING transcoding_name) The default precision is two digits after the decimal point. The optional arguments M and D specify the precision (M specifies the total number of digits)Īnd the scale (D specifies the number of digits after the decimal point) of theĭecimal value. See Practice #1-4.Ĭonverts a value to DECIMAL data type. See Practice #1-3.Ĭonverts a value to DATETIME data type in the format of YYYY-MM-DD HH:MM:SS. BINARY also causes trailing spaces to be significant.Ĭonverts a value to character type of data.ĬHAR(N) causes the convert to use no more than N characters of the argument.Ĭonverts a value to DATE data type in the format of YYYY-MM-DD.
This causes the comparison to be case sensitive even if the column isn'tĭefined as BINARY or BLOB. The type can be one of the following values:Īfter a value is converted to BINARY type, comparisons are conducted byte by byte rather thanĬharacter by character.
In this form, CONVERT takes a value in the form of expr and converts it to a value of type. There are three Conversion Functions in MySQL: CONVERT, CAST, BINARY.ĬONVERT can be used in either of the following two forms: MySQL Conversion Functions convert a value from one data type to another.
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