Values are treated as character strings having a character set.Ī string object whose value is chosen from a list of values given at the time of table creation. You do not need to specify length while creating a column. Large binary object that containing a variable amount of data. Columns are variable-length strings.Ī value from 0 to 255 before MySQL 5.0.3, and 0 to 65,535 in 5.0.3 and later versions. When stored, they are right-padded with spaces to the specified length.Ĭontains non-binary strings. Length is fixed as you declare while creating a table. Values are converted from the current time zone to UTC while storing, and converted back from UTC to the current time zone when retrieved.Ĭontains non-binary strings. Use when you need values containing both date and time information. So, for a column INT(3) ZEROFILL, 7 is displayed as 007. The default padding of spaces is replaced with zeroes. Where N is an integer and display width of the type is up to N digits. In the format b BIT(N), where N is an integer. Maximum number of digits allowed are 65 before MySQL 5.03 and 64 after 5.03. You are encouraged to review the original version for more depth.ĩ223372036854775807 to 18446744073709551615Ī precision from 0 to 23 results in a four-byte single-precision FLOAT column.Ī precision from 24 to 53 results in an eight-byte double-precision DOUBLE column. They have been trimmed down in an attempt to not introduce an overwhelming amount of detail. The tables below are adopted from ata-types.php. Familiarizing yourself with the types available in MySQL will lend to your ability to design efficient table structures. Since one of our goals in the relational approach to database design is reducing overall size, it is also important to consider the best fit data type for what we want to store. However, whenever we create a table structure in MySQL we must identify the data type we intend to store in any given column, and depending on the type of data and other features we may want, this is just the beginning. The next few pages will likely be a little dry.
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