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https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html
With a nonconstant initializer argument (such as a column name), the seed is initialized with the value for each invocation of RAND(). One implication of this behavior is that for equal argument values, RAND(N) returns the same value each time, and ...ABS(X) Returns the absolute value of X, or NULL if X is ...
https://dev.mysql.com/doc/refman/5.7/en/mrr-optimization.html
The MRR optimization is not supported with secondary indexes created on virtual generated columns. When MRR is used, the Extra column in EXPLAIN output shows Using MRR. Reading rows using a range scan on a secondary index can result in many random ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-row-format.html
The B-tree index that represents an entire table is known as the clustered index, which is organized according to the primary key columns. The nodes of a clustered index data structure contain the values of all columns in the row. The nodes of a ...
https://dev.mysql.com/doc/refman/5.7/en/faqs-tablespace-encryption.html
Can indexed columns be encrypted? InnoDB data-at-rest encryption supports all indexes transparently. The master encryption key is generated when tablespace encryption is enabled, and is stored outside the database. The master encryption key is ...Is ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-index-stat.html
The following options are used to generate and update the statistics tables in the NDB kernel. ndb_index_stat provides per-fragment statistical information about indexes on NDB tables. This includes cache version and age, number of index entries ...
https://dev.mysql.com/doc/refman/5.7/en/outer-join-optimization.html
If there is a row in A that matches the WHERE clause, but there is no row in B that matches the ON condition, an extra B row is generated with all columns set to NULL. For a LEFT JOIN, if the WHERE condition is always false for the generated NULL ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-limitations.html
No InnoDB table definition may contain a foreign key reference to a user-partitioned table; no InnoDB table with user-defined partitioning may contain columns referenced by foreign keys. ORDER BY column statement run against a partitioned table ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-differing-tables.html
A table on the source can have more or fewer columns than the replica's copy of the table. In addition, corresponding table columns on the source and the replica can use different data types, subject to certain conditions. (This is true even if both ... Source and target tables for replication do not have to be ...
https://dev.mysql.com/doc/refman/5.7/en/ansi-diff-comments.html
In this case, the generated statement looks like this: UPDATE account SET balance=balance--1 WHERE account_id=5752; balance--1 is valid standard SQL, but -- is interpreted as the start of a comment, and part of the expression is discarded. Standard ...
https://dev.mysql.com/doc/refman/5.7/en/channels-with-prev-replication.html
When a replica has multiple channels and a FOR CHANNEL channel option is not specified, a valid statement generally acts on all available channels, with some specific exceptions. For example, the following statements behave as expected for all ...