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https://dev.mysql.com/doc/refman/8.0/en/json-modification-functions.html
JSON_ARRAY_INSERT(json_doc, path, val[, path, val] ...) Updates a JSON document, inserting into an array within the document and returning the modified document. In MySQL 8.0.4, the optimizer can perform a partial, in-place update of a JSON column ... The functions in this section modify JSON values and return the ...An error occurs if the json_doc argument is not a valid JSON document or any path ...
https://dev.mysql.com/doc/refman/8.0/en/comparison-operators.html
For DATE and DATETIME columns that are declared as NOT NULL, you can find the special date '0000-00-00' by using a statement like this: SELECT * FROM tbl_name WHERE date_column IS NULL This is needed to get some ODBC applications to work because ...
https://dev.mysql.com/doc/refman/8.0/en/with.html
A common table expression (CTE) is a named temporary result set that exists within the scope of a single statement and that can be referred to later within that statement, possibly multiple times. For queries that execute and thus recurse slowly or ...Common Table Expressions Recursive Common Table Expressions Limiting Common Table Expression Recursion Recursive Common Table Expression Examples Common Table Expressions Compared to Similar Constructs For information about CTE optimization, see Section 10.2.2.4, “Optimizing Derived Tables, View References, and Common Table Expressions with Merging or ...
https://dev.mysql.com/doc/refman/8.0/en/data-directory-initialization.html
To arrange for MySQL to start without manual intervention at system boot time, see Section 2.9.5, “Starting and Stopping MySQL Automatically”. Within the data directory, the server creates the mysql system schema and its tables, including the ...
https://dev.mysql.com/doc/refman/8.0/en/connection-control-plugin-installation.html
To set the relevant variables at server startup, put these lines in the server my.cnf file: [mysqld] plugin-load-add=connection_control.so connection-control-failed-connections-threshold=4 connection-control-min-connection-delay=2000 To set and ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-system-variables.html
The default value is calculated at server build time based on the number of commands in the client/server protocol and the number of SQL statement types supported by the server. Performance Schema system variables have the following meanings: ...The ...
https://dev.mysql.com/doc/refman/8.0/en/semijoins.html
A semijoin is a preparation-time transformation that enables multiple execution strategies such as table pullout, duplicate weedout, first match, loose scan, and materialization. For an inner join between two tables, the join returns a row from one ...The optimizer uses semijoin strategies to improve subquery execution, as described in this ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-cloning.html
Using a remote cloning operation in the event of a large transaction gap lets you add new members to the group without transferring the group's data to the server manually beforehand, and also enables a member that is very out of date to catch up ...
https://dev.mysql.com/doc/refman/8.0/en/replication-options-gtids.html
A SET @@GLOBAL.gtid_purged statement was issued on MySQL 5.7.7 or earlier, and the binary log that was active at the time of the SET @@GLOBAL.gtid_purged statement has not yet been purged. gtid_executed_compression_period Command-Line Format ... The ...For additional information, see Section 19.1.3, “Replication with Global Transaction ...
https://dev.mysql.com/doc/refman/8.0/en/create-procedure.html
The DEFINER and SQL SECURITY clauses specify the security context to be used when checking access privileges at routine execution time, as described later in this section. For NOW(), the binary log includes the timestamp and replicates correctly. By ...