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https://dev.mysql.com/doc/refman/5.7/en/string-comparison-functions.html
If either expr or pat is NULL, the result is NULL. Note Aggregate queries involving NOT LIKE comparisons with columns containing NULL may yield unexpected results. For example, consider the following table and data: CREATE TABLE foo (bar ... Table ...
https://dev.mysql.com/doc/refman/5.7/en/string-type-syntax.html
CHAR(0) is also quite nice when you need a column that can take only two values: A column that is defined as CHAR(0) NULL occupies only one bit and can take only the values NULL and '' (the empty string). A string object that can have only one ...
https://dev.mysql.com/doc/refman/5.7/en/string-literals.html
A string is a sequence of bytes or characters, enclosed within either single quote (') or double quote (") characters. Examples: 'a string' "another string" Quoted strings placed next to each other are concatenated to a single string. The following ...
https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html
Attempting to use them as the character_set_client value produces an error. If explicit_defaults_for_timestamp is disabled, the server enables the nonstandard behaviors and handles TIMESTAMP columns as follows: TIMESTAMP columns not explicitly ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-connection-strings.html
With the exception of the NDB Cluster management server (ndb_mgmd), each node that is part of an NDB Cluster requires a connection string that points to the management server's location. This connection string is used in establishing a connection ...
https://dev.mysql.com/doc/refman/5.7/en/string-collating.html
For a simple character set named MYSET, sorting rules are specified in the MYSET.xml configuration file using <map> array elements within <collation> elements. If the sorting rules for your language are too complex to be handled with simple arrays, ...
https://dev.mysql.com/doc/refman/5.7/en/string-types.html
The string data types are CHAR, VARCHAR, BINARY, VARBINARY, BLOB, TEXT, ENUM, and SET. For information about storage requirements of the string data types, see Section 11.7, “Data Type Storage Requirements”. For descriptions of functions that ...
https://dev.mysql.com/doc/refman/5.7/en/connection-control-plugin-installation.html
This section describes how to install the connection control plugins, CONNECTION_CONTROL and CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS. For general information about installing plugins, see Section 5.5.1, “Installing and Uninstalling Plugins”.
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-options-variables.html
row *************************** id: 1 select_type: SIMPLE table: d type: ALL possible_keys: PRIMARY key: NULL key_len: NULL ref: NULL rows: 9 Extra: Parent of 4 pushed join@1 *************************** 2. ndb_slave_conflict_role can take any one of ... This section provides information about MySQL server options, server and status variables that are specific to NDB ...
https://dev.mysql.com/doc/refman/5.7/en/load-data.html
The rules for NULL handling are described later in this section. \Z ASCII 26 (Control+Z) \N NULL For more information about \-escape syntax, see Section 9.1.1, “String Literals”. If the FIELDS ESCAPED BY character is empty, no characters are ...