mysql data type conversion

MySQL basics 06 data type (6) type conversion, mysql Data Type1.Cast () Usage In MySQL, cast (value as target type) syntax can be used for conversion of most types.   Cast must be followed by left parentheses: Mysql> select cast (123 as char ); + ---

MySQL date data type and time type usage summary MySQL date type: Date format, storage space occupied, date range comparison. Date type storage space date format date range -----------------------------------------------------------------------------

MySQL date type: Date Format, storage space occupied, and date range comparison.Date type storage space date format date range-----------------------------------------------------------------------------------Datetime 8 bytes YYYY-MM-DD hh: mm: SS 10

Impact of type conversion on MySQL index selection bitsCN.com I encountered several cases where MySQL did not use the expected index. after reading some documents, I found that the impact of MySQL type conversion on index selection is not small. For

Turn from:http://blog.chinaunix.net/space.php?uid=11327712&do=blog&id=32416MySQL Date Type: Date format, occupied storage space, date range comparison.Date type storage space date format date range-----------------------------------------------------

2.4 Expression evaluation and type conversionMySQL allows you to write expressions that include constants, function calls, and table-column references. These values can be grouped using different types of operators, such as arithmetic or comparison

Analysis of MySQL explicit type conversion, analysis of mysql explicit CAST Function In the previous article, we mentioned the CAST function for display type conversion. There are many benefits to avoid implicit type conversion. In fact, there are

A. Numeric type MySQL supports numeric types in all standard SQL, including strict data types (integer,smallint,decimal,numberic), and approximate numeric data types (float,real,double presision). And on this basis to expand. After the expansion,

1. Integral type MySQL data type Meaning (Signed) tinyint (m) 1 byte range ( -128~127) smallint (m) 2 byte range ( -32768~32767) Mediumint (M) 3 byte range ( -8388608~8388607)

First, the literal value 1. StringA string is a sequence of characters that is caused by a single quotation mark ("') or double quotation mark ('" '). For example:‘a string‘"another string"If SQL Server mode is enabled for Nsi_quotes, you can refer