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https://dev.mysql.com/doc/refman/8.0/en/date-and-time-literals.html
Beginning with MySQL 8.0.29, using any character other than the dash (-) as the delimiter raises a warning, as shown here: mysql> SELECT DATE'2012@12@31'; +------------------+ | DATE'2012@12@31' | +------------------+ | 2012-12-31 | ... Standard SQL ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-thread-filtering.html
The threads table contains a row for each server thread. Each row contains information about a thread and indicates whether monitoring is enabled for it. For foreground threads (resulting from client connections), the initial values of the ...For ...
https://dev.mysql.com/doc/refman/8.0/en/json-table-functions.html
We refer to the JSON value matching the path as the row source; this is used to generate a row of relational data. The COLUMNS clause evaluates the row source, finds specific JSON values within the row source, and returns those JSON values as SQL ...
https://dev.mysql.com/doc/refman/8.0/en/connection-access.html
The server performs identity and credentials checking using columns in the user table, accepting the connection only if these conditions are satisfied: The client host name and user name match the Host and User columns in some user table row. The ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-metrics-table.html
Create a simple InnoDB table: mysql> USE test; Database changed mysql> CREATE TABLE t1 (c1 INT) ENGINE=INNODB; Query OK, 0 rows affected (0.02 sec) Enable the dml_inserts counter. row *************************** NAME: dml_inserts SUBSYSTEM: dml ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-transaction-isolation-levels.html
Because gap locking is disabled, phantom row problems may occur, as other sessions can insert new rows into the gaps. Only row-based binary logging is supported with the READ COMMITTED isolation level. If you use READ COMMITTED with ... Transaction ...
https://dev.mysql.com/doc/refman/8.0/en/limit-optimization.html
If you need only a specified number of rows from a result set, use a LIMIT clause in the query, rather than fetching the whole result set and throwing away the extra data. MySQL sometimes optimizes a query that has a LIMIT row_count clause and no ...If ordering is done by using an index, this is very ...
https://dev.mysql.com/doc/refman/8.0/en/update.html
To avoid this problem, add an ORDER BY clause to cause the rows with larger id values to be updated before those with smaller values: UPDATE t SET id = id + 1 ORDER BY id DESC; You can also perform UPDATE operations covering multiple tables. UPDATE ...An UPDATE statement can start with a WITH clause to define common table expressions accessible within the ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndb-api-statistics.html
Ndb_api_pruned_scan_count_session Ndb_api_pruned_scan_count_slave [none] Ndb_api_pruned_scan_count ScanBatchCount Number of batches of rows received. (A batch in this context is a set of scan results from a single fragment.) ... A number of types of ...
https://dev.mysql.com/doc/refman/8.0/en/problems-connecting.html
In this case, the host name must be specified in a user table row on the server host, even though you are running the client program on the same host as the server. Normally, you should have one row in the user table that exactly matches the host ...