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https://dev.mysql.com/doc/refman/5.7/en/subquery-restrictions.html
In general, you cannot modify a table and select from the same table in a subquery. For example, this limitation applies to statements of the following forms: DELETE FROM t WHERE ... FROM t ...); Exception: The preceding prohibition does not apply ...
https://dev.mysql.com/doc/refman/5.7/en/switchable-optimizations.html
For more information, see Section 8.2.2.1, “Optimizing Subqueries, Derived Tables, and View References with Semijoin Transformations”. For more information, see Section 8.2.2, “Optimizing Subqueries, Derived Tables, and View References”. Its ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-trace-statement-digest.html
Traces all Performance Schema instrumentation for a specific statement digest. If you find a statement of interest within the Performance Schema events_statements_summary_by_digest table, specify its DIGEST column MD5 value to this procedure and ...
https://dev.mysql.com/doc/refman/5.7/en/alter-table.html
That is, a table-copying operation always includes at least the concurrency restrictions of LOCK=SHARED (allow queries but not DML). You can further restrict concurrency for operations that support the LOCK clause by specifying LOCK=EXCLUSIVE, which ... ALTER TABLE tbl_name [alter_option [, alter_option] ...] [partition_options] alter_option: { table_options | ADD [COLUMN] col_name column_definition [FIRST | AFTER col_name] | ADD [COLUMN] (col_name column_definition,...) | ADD {INDEX | KEY} [index_name] [index_type] (key_part,...) [index_option] ...
https://dev.mysql.com/doc/refman/5.7/en/batch-mode.html
You can generate new queries from existing ones that are similar by copying and editing script files. In the previous sections, you used mysql interactively to enter statements and view the results. If you want the script to continue even if some ...
https://dev.mysql.com/doc/refman/5.7/en/create-table-generated-columns.html
Generated columns have several use cases, such as these: Virtual generated columns can be used as a way to simplify and unify queries. A complicated condition can be defined as a generated column and referred to from multiple queries on the table to ...Values of a generated column are computed from an expression included in the column ...
https://dev.mysql.com/doc/refman/5.7/en/create-table-ndb-comment-options.html
NDB_COLUMN Options NDB_TABLE Options It is possible to set a number of options specific to NDB Cluster in the table comment or column comments of an NDB table. Table-level options for controlling read from any replica and partition balance can be ...
https://dev.mysql.com/doc/refman/5.7/en/create-view.html
For queries that select from either view fewer than 2 columns (the number named in the ORDER BY clause), an error occurs if the server evaluates the view using the MERGE algorithm. If the view does not exist, CREATE OR REPLACE VIEW is the same as ...
https://dev.mysql.com/doc/refman/5.7/en/data-masking-usage.html
Creating Views that Display Masked Data If masked data from a table is used for multiple queries, it may be convenient to define a view that produces masked data. That way, applications can select from the view without performing masking in ...
https://dev.mysql.com/doc/refman/5.7/en/derived-tables.html
A derived table is an expression that generates a table within the scope of a query FROM clause. For example, a subquery in a SELECT statement FROM clause is a derived table: SELECT ... The [AS] tbl_name clause is mandatory because every table in a ...