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https://dev.mysql.com/doc/refman/9.7/en/sys-ps-thread-id.html
Parameters in_connection_id BIGINT UNSIGNED: The ID of the connection for which to return the thread ID. Note ps_thread_id() is deprecated, and subject to removal in a future MySQL version. Applications that use it should be migrated to use the ...
https://dev.mysql.com/doc/refman/9.7/en/sys-schema-auto-increment-columns.html
For example, for a column with a bigint(20) unsigned column type, the data type is just bigint. This view indicates which tables have AUTO_INCREMENT columns and provides information about those columns, such as the current and maximum column values ...
https://dev.mysql.com/doc/refman/9.7/en/update.html
UPDATE is a DML statement that modifies rows in a table. An UPDATE statement can start with a WITH clause to define common table expressions accessible within the UPDATE. Single-table syntax: UPDATE [LOW_PRIORITY] [IGNORE] table_reference SET ...
https://dev.mysql.com/doc/refman/9.7/en/cast-functions.html
Table 14.15 Cast Functions and Operators Name Description Deprecated BINARY Cast a string to a binary string Yes CAST() Cast a value as a certain type CONVERT() Cast a value as a certain type Cast functions and operators enable conversion of values ...
https://dev.mysql.com/doc/refman/9.7/en/limit-optimization.html
If you need only a specified number of rows from a result set, use a LIMIT clause in the query, rather than fetching the whole result set and throwing away the extra data. MySQL sometimes optimizes a query that has a LIMIT row_count clause and no ...
https://dev.mysql.com/doc/refman/9.7/en/hexadecimal-literals.html
In numeric contexts, MySQL treats a hexadecimal literal like a BIGINT UNSIGNED (64-bit unsigned integer). Hexadecimal literal values are written using X'val' or 0xval notation, where val contains hexadecimal digits (0..9, A..F). Lettercase of the ...
https://dev.mysql.com/doc/refman/9.7/en/keywords.html
Certain keywords, such as SELECT, DELETE, or BIGINT, are reserved and require special treatment for use as identifiers such as table and column names. This may also be true for the names of built-in functions. Some keywords which are otherwise ...
https://dev.mysql.com/doc/refman/9.7/en/innodb-fulltext-index.html
If you want to create your own FTS_DOC_ID column, the column must be defined as BIGINT UNSIGNED NOT NULL and named FTS_DOC_ID (all uppercase), as in the following example: Note The FTS_DOC_ID column does not need to be defined as an AUTO_INCREMENT ... Full-text indexes are created on text-based columns (CHAR, VARCHAR, or TEXT columns) to speed up queries and DML operations on data contained within those ...
https://dev.mysql.com/doc/refman/9.7/en/sys-ps-setup-disable-thread.html
Given a connection ID, disables Performance Schema instrumentation for the thread. This is a value of the type given in the PROCESSLIST_ID column of the Performance Schema threads table or the Id column of SHOW PROCESSLIST output. Example Disable a ...
https://dev.mysql.com/doc/refman/9.7/en/server-system-variables.html
timestamp is a DOUBLE rather than BIGINT because its value includes a microseconds part. The MySQL server maintains many system variables that affect its operation. Most system variables can be set at server startup using options on the command ...