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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 ...If ...
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 ...It has a character set other than binary and a collation that is compatible with the character ...
https://dev.mysql.com/doc/refman/5.7/en/timestamp-initialization.html
In addition, if the explicit_defaults_for_timestamp system variable is disabled, you can initialize or update any TIMESTAMP (but not DATETIME) column to the current date and time by assigning it a NULL value, unless it has been defined with the NULL ... TIMESTAMP and DATETIME columns can be automatically initializated and updated to the current date and time (that is, the current ...
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 ...This port should always be available on the network because it has been assigned by IANA for this purpose (see http://www.iana.org/assignments/port-numbers for ...
https://dev.mysql.com/doc/refman/5.7/en/string-collating.html
If the sorting rules for your language are too complex to be handled with simple arrays, you must define string collating functions in the ctype-MYSET.c source file in the strings directory. Look at the ctype-*.c files in the strings directory, such ... For a simple character set named MYSET, sorting rules are specified in the MYSET.xml configuration file using <map> array elements within <collation> ...
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/myisampack.html
--debug[=debug_options], -# [debug_options] Command-Line Format --debug[=debug_options] Type String Default Value d:t:o Write a debugging log. --join=big_tbl_name, -j big_tbl_name Command-Line Format --join=big_tbl_name Type String Join all tables ...When the table is used later, the server reads into memory the information needed to decompress ...
https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html
Returns NULL if any argument is NULL, or if the path argument does not identify a section of the target document. Returns NULL if any argument is NULL or no paths locate a value in the document. column->path In MySQL 5.7.9 and later, the -> operator ... The functions in this section perform search operations on JSON values to extract data from them, report whether data exists at a location within them, or report the path to data within ...
https://dev.mysql.com/doc/refman/5.7/en/explain-output.html
The value can be NULL if the row refers to the union result of other rows. If this column is NULL (or undefined in JSON-formatted output), there are no relevant indexes. If key is NULL, MySQL found no index to use for executing the query more ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-files-table.html
The value is NULL for all data files except for predefined system tablespace data files. A NULL value for a predefined system tablespace data file indicates that a file size limit was not defined explicitly. Where no value is provided by the ... The ...