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https://dev.mysql.com/doc/refman/5.7/en/example-maximum-row.html
Task: Find the number, dealer, and price of the most expensive article.
https://dev.mysql.com/doc/refman/5.7/en/example-user-variables.html
You can employ MySQL user variables to remember results without having to store them in temporary variables in the client.
https://dev.mysql.com/doc/refman/5.7/en/explain-extended.html
<in_optimizer>(query fragment) This is an internal optimizer object with no user significance. <ref_null_helper>(expr) This is an internal optimizer object with no user significance. <temporary table> This represents an internal temporary table ...
https://dev.mysql.com/doc/refman/5.7/en/explain-for-connection.html
To obtain the execution plan for an explainable statement executing in a named connection, use this statement: EXPLAIN [options] FOR CONNECTION connection_id; EXPLAIN FOR CONNECTION returns the EXPLAIN information that is currently being used to ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-recovering-from-a-point-in-time.html
This is the job of binary log view markers, which mark view changes in the binary log stream, and also contain additional metadata information, provisioning the server joining the group with missing certification related data. This concept is ... To ...
https://dev.mysql.com/doc/refman/5.7/en/if.html
If a given search_condition evaluates to true, the corresponding THEN or ELSEIF clause statement_list executes. [ELSE statement_list] END IF The IF statement for stored programs implements a basic conditional construct. Note There is also an IF() ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-cmp-per-index-table.html
In this context, the table data is treated as just another index, one that happens to contain all the columns: the clustered index. COMPRESS_TIME The total time in seconds used for compressing data in this index. UNCOMPRESS_TIME The total time in ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-cmp-table.html
Use the INFORMATION_SCHEMA COLUMNS table or the SHOW COLUMNS statement to view additional information about the columns of this table, including data types and default values. The INNODB_CMP and INNODB_CMP_RESET tables provide status information on ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-sys-columns-table.html
For character columns in multibyte character sets, this length value is the maximum length in bytes needed to represent a definition such as VARCHAR(N); that is, it might be 2*N, 3*N, and so on depending on the character encoding. row ... The ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-sys-fields-table.html
The INNODB_SYS_FIELDS table has these columns: INDEX_ID An identifier for the index associated with this key field; the same value as INNODB_SYS_INDEXES.INDEX_ID. row *************************** INDEX_ID: 117 NAME: col1 POS: 0 Notes You must have ...