Working with Data in MySQL

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This documentation is for an older version. If you're using the most current version, select the documentation for that version with the version switch in the upper right corner of the online documentation, or by downloading a newer PDF or EPUB file. This is an easy way to force a column comparison to be done byte by byte rather than character by character.

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:. The type for the result can be one of the following values:. As of MySQL 5. Normally, you cannot compare a BLOB value or other binary string in case-insensitive fashion because binary strings have no character set, and thus no concept of lettercase.

Comparisons of the result use the string collation. For example, if the character set of the result 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. To perform lettercase conversion, convert the string to a nonbinary string:. The functions also can be 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:. To cast a string to a numeric value in numeric context, you normally do not have to do anything other than to use the string value as though it were a number:.

If you use a string in an arithmetic operation, it is converted to a floating-point number during expression evaluation. If you use a number in string context, the number automatically is converted to a string:. This results in the value being truncated when casting to a numeric type, as shown here:. 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.

For example, this statement converts the string 'abc' in the default character set to the corresponding string in the utf8 character set:

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GeeksEngine is hosted by HostGator. The optional arguments M and D specify the precision M specifies the total number of digits and the scale D specifies the number of digits after the decimal point of the decimal value. The default precision is two digits after the decimal point. For an example of a practical use, read Tip 2 in How to enforce data type constraint article.

In MySQL, transcoding names are the same as the corresponding character set names. This is an easy way to force a column comparison to be done byte by byte rather than character by character. Note that the SQL needs to end with semi-colon if you have multiple queries in the query window. Most of the queries in the tutorials need Northwind MySQL database, you can download the database script on this page.

Query result set - rows returned: Query result set - 1 row returned: Query result set - 77 rows returned: Other tutorials in this category 1. Using String Functions, Part 1 2. Using String Functions, Part 2 3. Using String Functions, Part 3 4. No portion may be reproduced without my written permission. Software and hardware names mentioned on this site are registered trademarks of their respective companies. Should any right be infringed, it is totally unintentional.

Drop me an email and I will promptly and gladly rectify it. CustomerID is a varchar type of column but after the conversion, it becomes binary type. The result is always in HH: This query converts an unsigned integer the result of to unsigned integer.

In the second part of the SELECT statement, the result is converted to signed integer so the correct result is displayed. It displays that y is internally represented by 1 and n is internally represented by 2.

Conversions can be conducted between string, date, and numeric type of data. The type can be one of the following values: TIME Converts a signed integer to an unsigned integer.

See Practice and Practice It casts a string following it to a binary string. This website is hosted by HostGator.