CAST function

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Cast functions and operators oracle sql convert binary to string conversion of values from one data type to another. For example, this is legal:. Normally, you cannot compare a BLOB value or other binary string in case-insensitive fashion because binary strings use the binary character set, which has no collation with the concept of lettercase.

Comparisons of the resulting string use its collation. For example, if the conversion result character set has a case-insensitive collation, a LIKE operation is not case-sensitive:. To use a different character set, substitute its name for latin1 in the preceding statement. For example, a comparison of these strings results in an error because they have different character sets:. Converting one of the strings to a character set compatible with the other enables the comparison to occur without error:.

Unlike conversion functions such as CASTor CONVERTwhich convert a string from one character set to another, an introducer designates a string literal as having a particular character set, with no conversion involved.

Character set conversion is also useful preceding lettercase conversion of binary strings. To perform lettercase conversion of a binary string, first convert it to a nonbinary string:. The cast functions are useful for sorting ENUM columns in lexical order. Normally, sorting of ENUM columns occurs using the internal numeric values. Casting the values to CHAR results in a lexical sort:.

For temporal values, there is little need to use CAST to extract data in different formats. To cast a string to a number, you normally oracle sql convert binary to string do nothing other than use the string value in numeric context:. That is also true for hexadecimal and bit literals, which are binary strings by default:. A string used in an arithmetic operation is oracle sql convert binary to string to a floating-point number during expression evaluation.

MySQL supports arithmetic with both signed and unsigned bit values. If either operand is a floating-point value, the result is a floating-point value and is not affected by the preceding rule. A common use for BINARY is to force a character string comparison to be done byte by byte rather than character by character, in effect becoming case-sensitive. For purposes of converting a string expression to a binary string, these constructs are equivalent:. For example, the following pairs of definitions are equivalent:.

In MySQL, transcoding names are the same as the corresponding character set names. For example, this statement converts the string 'abc' in the default character set to the corresponding string in the utf8 character set:. These type values are permitted:. Values shorter than N bytes are padded with 0x00 bytes to a length of N. Produces a string with the CHAR data type.

No padding occurs for values shorter than N characters. Produces a string with the given character set. In all cases, the string has the default collation for the character set. Produces a DATE value. If the optional M and D values are given, they specify the maximum number of digits the oracle sql convert binary to string and the number of digits following the decimal point the scale.

Oracle sql convert binary to string a JSON value. Like CHARbut produces a string with the national character set. Produces a TIME value. For purposes of converting a string expression to a binary string, these constructs are equivalent: For example, the following pairs of definitions are equivalent: For example, this statement converts the string 'abc' in the default character set to the corresponding string in the utf8 character set: These type values are permitted:

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The type of data to which you want to convert expression. Does not indicate conversion to a standard Oracle data type but allows additional conversion capabilities. The internal representation of every value, regardless of data type, is returned as a text value. For TEXT data types, the result will be the value itself and will therefore be of variable length.

Converts a number to a decimal value and then to packed format -- a text value 8 bytes long containing 15 digits and a plus or minus sign. A TEXT character is encoded in the database character set. A Boolean expression that determines whether commas are used to mark thousands and millions in the text representation of the numeric data. When the value of the expression is YES , commas are used. A Boolean expression that determines whether negative values are enclosed in parentheses in the text representation of the numeric data.

When the value of the expression is YES , parentheses are used; when the value is NO , a minus sign precedes negative values.

A text expression that specifies the template to use when converting a datetime expression to text. A text expression that specifies the template to use when converting a DATE-only expression to text. The template can include format specifications for any of the four components of a date day, month, year, and day of the week.

You can include additional text before, after, or between the components. In this example, today's date is March 31, , and the SHOW statement presents it in the following format. The template can include format specifications for any of the components of a time period. Time period components include all the components of a date day, month, year, and day of the week , plus the fiscal year and period components.

Each component in the template must be preceded by a left angle bracket and followed by a right angle bracket. However, a VNF command template must be designed for precise and unambiguous interpretation of input, while the vnf argument is not so constrained. Therefore, the format styles allowed in the vnf argument are more extensive than those allowed in a VNF command template. Append a B code to any of these formats to indicate that you want to display the beginning day or month of the period, rather than the final day or month.

This contrasts with the template in a VNF command, in which only certain format combinations are valid for each type of dimension. When you do not include the vnf argument, the format of the result is determined by the VNF of the dimension whose values you are converting. When the dimension has no VNF, the result is formatted according to the default VNF for the type of dimension being converted. A text expression that specifies how to interpret the specified text value as a DATE-only value when the order of the text value's components month, day, and year is ambiguous.

The expression can be one of the following: Each letter represents a component of the date: When you do not include the date-order or dwmqy-dimname argument, any ambiguity in the interpretation of a text expression is resolved by the current setting of the DATEORDER option. The minimum width is 7. This argument is required when you specify the escape-int argument.

Indicates whether escape sequences are to be used in the output. Do not use escapes. It can evaluate to 1 , 2 , or 4 bytes. When the width is invalid or specified for some other data type, an error occurs. A keyword indicating that no character set conversion should be performed. The maximum number of characters in a line is This can occur when the source line exceeds 99 characters and enough of them need escape sequences. Valid dates range from January 1, sequence number 1 to December 31, sequence number 2,, This behavior reflects the fact that the values of a relation are dimension values, not TEXT values.

The result is the value in the specified data type; or NA when the value is outside the range of valid values for the target data type. You can omit punctuation included in the format string from the datetime string if all the digits of the numerical format elements, including leading zeros, are specified.

When a match fails between a datetime format element and the corresponding characters in the date string, then Oracle attempts alternative format elements, as shown in Table , "Oracle Format Matching".

Table Oracle Format Matching. In both cases, you get a result of Return Value The return value depends on the value of the type argument. For all other data types, the result will be 4 bytes long. PACKED Converts a number to a decimal value and then to packed format -- a text value 8 bytes long containing 15 digits and a plus or minus sign. Default Use escapes for unprintable characters.