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https://dev.mysql.com/doc/refman/5.7/en/key-space.html
If the first index part is a string, it is also prefix compressed. Space compression makes the index file smaller than the worst-case figure if a string column has a lot of trailing space or is a VARCHAR column that is not always used to the full ...
https://dev.mysql.com/doc/refman/5.7/en/migrating-from-year2.html
YEAR(2) Limitations Issues with the YEAR(2) data type include ambiguity of displayed values, and possible loss of information when values are dumped and reloaded or converted to strings. Conversion of a 2-digit or 4-digit YEAR data value to string ... This section describes problems that can occur when using the 2-digit YEAR(2) data type and provides information about converting existing YEAR(2) columns to 4-digit year-valued columns, which can be declared as YEAR with an implicit display width of 4 characters, or equivalently as YEAR(4) with an explicit display ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-size-pl.html
This is a Perl script that can be used to estimate the amount of space that would be required by a MySQL database if it were converted to use the NDBCLUSTER storage engine. Unlike the other utilities discussed in this section, it does not require ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-tips.html
Suppose that an indexed string column c1 is compared to a numeric value using WHERE c1 = 2222. For such comparisons, the string value is converted to a number and the operands are compared numerically (see Section 12.3, “Type Conversion in ...
https://dev.mysql.com/doc/refman/5.7/en/character-arrays.html
For a complex character set as implemented in a ctype-MYSET.c file in the strings directory, there are corresponding arrays: ctype_MYSET[], to_lower_MYSET[], and so forth. See the CHARSET_INFO.txt file in the strings directory for additional ...
https://dev.mysql.com/doc/refman/5.7/en/charset-gb18030.html
Supports comparison between gb18030 strings, and between gb18030 strings and strings of other character sets. In MySQL, the gb18030 character set corresponds to the “Chinese National Standard GB 18030-2005: Information technology — Chinese ...
https://dev.mysql.com/doc/refman/5.7/en/error-message-elements.html
Error Message Elements When an error occurs, error information includes several elements: an error code, SQLSTATE value, and message string. SQLSTATE value: This value is a five-character string (for example, '42S02'). Message string: This string ...
https://dev.mysql.com/doc/refman/5.7/en/fulltext-boolean.html
With this modifier, certain characters have special meaning at the beginning or end of words in the search string. Specify the search words within a double-quoted string immediately before the @distance operator, for example, MATCH(col1) ... MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/identifiers.html
mysql> SET sql_mode='ANSI_QUOTES'; mysql> CREATE TABLE "test" (col INT); Query OK, 0 rows affected (0.00 sec) The ANSI_QUOTES mode causes the server to interpret double-quoted strings as identifiers. Consequently, when this mode is enabled, string ... Certain objects within MySQL, including database, table, index, column, alias, view, stored procedure, partition, tablespace, and other object names are known as ...
https://dev.mysql.com/doc/refman/5.7/en/index-btree-hash.html
The index also can be used for LIKE comparisons if the argument to LIKE is a constant string that does not start with a wildcard character. LIKE '%string%' and string is longer than three characters, MySQL uses the Turbo Boyer-Moore algorithm to ...