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https://dev.mysql.com/doc/refman/5.7/en/spatial-operator-functions.html
This function processes geometry collections by extracting all vertex points of all components of the collection, creating a MultiPoint value from them, and computing its convex hull. OpenGIS proposes a number of functions that can produce ...
https://dev.mysql.com/doc/refman/5.7/en/statement-caching.html
Metadata changes occur for DDL statements such as those that create, drop, alter, rename, or truncate tables, or that analyze, optimize, or repair tables. For certain statements that a client might execute multiple times during a session, the ...
https://dev.mysql.com/doc/refman/5.7/en/statement-labels.html
[begin_label:] BEGIN [statement_list] END [end_label] [begin_label:] LOOP statement_list END LOOP [end_label] [begin_label:] REPEAT statement_list UNTIL search_condition END REPEAT [end_label] [begin_label:] WHILE search_condition DO statement_list ...
https://dev.mysql.com/doc/refman/5.7/en/static-format.html
Creating a table with these columns with an explicit ROW_FORMAT clause does not raise an error or warning; the format specification is ignored. It is used when the table contains no variable-length columns (VARCHAR, VARBINARY, BLOB, or TEXT). Of the ...
https://dev.mysql.com/doc/refman/5.7/en/string-comparison-functions.html
For example, consider the following table and data: CREATE TABLE foo (bar VARCHAR(10)); INSERT INTO foo VALUES (NULL), (NULL); The query SELECT COUNT(*) FROM foo WHERE bar LIKE '%baz%'; returns 0. Table 12.13 String Comparison Functions and ...
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 ...
https://dev.mysql.com/doc/refman/5.7/en/uninstall-plugin.html
If you are uninstalling a plugin with no intention of reinstalling it later and you care about the table contents, you should dump the table with mysqldump and remove the WITH PARSER clause from the dumped CREATE TABLE statement so that you can ...
https://dev.mysql.com/doc/refman/5.7/en/using-stack-trace.html
If that does not help you find out why mysqld died, you should create a bug report and include the output from the preceding command with the bug report. On some operating systems, the error log contains a stack trace if mysqld dies unexpectedly.
https://dev.mysql.com/doc/refman/5.7/en/verifying-index-usage.html
Always check whether all your queries really use the indexes that you have created in the tables. Use the EXPLAIN statement, as described in Section 8.8.1, “Optimizing Queries with EXPLAIN”.
https://dev.mysql.com/doc/refman/5.7/en/where-optimization.html
If there is an ORDER BY clause and a different GROUP BY clause, or if the ORDER BY or GROUP BY contains columns from tables other than the first table in the join queue, a temporary table is created. This section discusses optimizations that can be ...