Search Results
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-events-statements-current-table.html
END_EVENT_ID This column is set to NULL when the event starts and updated to the thread current event number when the event ends. If an event is produced from an instrument that has TIMED = NO, timing information is not collected, and TIMER_START, ...The table stores one row per thread showing the current status of the thread's most recent monitored statement event, so there is no system variable for configuring the table ...
https://dev.mysql.com/doc/refman/8.4/en/replication-gtids-concepts.html
A global transaction identifier (GTID) is a unique identifier created and associated with each transaction committed on the server of origin (the source). This identifier is unique not only to the server on which it originated, but is unique across ...
https://dev.mysql.com/doc/refman/8.4/en/with.html
The types of the CTE result columns are inferred from the column types of the nonrecursive SELECT part only, and the columns are all nullable. The use of COALESCE() avoids displaying NULL in the sum_price column on days for which no sales data occur ... 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 ...
https://dev.mysql.com/doc/mysql-ai/9.4/en/mys-ai-aml-scoring-an-anomaly-detection-model.html
For the option to set the user name, you can set it to NULL. mysql> CALL sys.ML_MODEL_LOAD(@model, NULL); The following example uses the model handle. mysql> CALL sys.ML_MODEL_LOAD('anomaly_detection_semi_supervised_use_case', NULL); Score the model ... After generating predictions, you can score the model to assess its ...
https://dev.mysql.com/doc/mysql-ai/9.4/en/mys-mysqlai-train-test-split.html
TRAIN_TEST_SPLIT Syntax mysql> CALL sys.TRAIN_TEST_SPLIT ('table_name', 'target_column_name', [options | NULL]); options: { JSON_OBJECT("key","value"[,"key","value"] ...) "key","value": { ['task', ... The TRAIN_TEST_SPLIT routine automatically ...
https://dev.mysql.com/doc/refman/8.4/en/any-in-some-subqueries.html
The expression is unknown (that is, NULL) if table t2 contains (NULL,NULL,NULL). The expression is TRUE if table t2 contains (21,14,7) because there is a value 7 in t2 that is less than 10. The expression is FALSE if table t2 contains (20,10), or if ...
https://dev.mysql.com/doc/refman/8.4/en/explain-extended.html
row *************************** id: 1 select_type: PRIMARY table: t1 type: index possible_keys: NULL key: PRIMARY key_len: 4 ref: NULL rows: 4 filtered: 100.00 Extra: Using index *************************** 2. row *************************** id: 2 ... The EXPLAIN statement produces extra (“extended”) information that is not part of EXPLAIN output but can be viewed by issuing a SHOW WARNINGS statement following ...
https://dev.mysql.com/doc/refman/8.4/en/index-page-merge-threshold.html
row *************************** Table: t2 Create Table: CREATE TABLE `t2` ( `id` int(11) DEFAULT NULL, KEY `id_index` (`id`) COMMENT 'MERGE_THRESHOLD=40' ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci Note A MERGE_THRESHOLD value ...If the “page-full” percentage for an index page falls below the MERGE_THRESHOLD value when a row is deleted or when a row is shortened by an UPDATE operation, InnoDB attempts to merge the index page with a neighboring index ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-limitations-syntax.html
Attempting to create an index on an NDB table column whose width is greater than 3072 bytes is rejected with ER_TOO_LONG_KEY: Specified key was too long; max key length is 3072 bytes. Attempting to create an index on an NDB table column whose width ... Some SQL statements relating to certain MySQL features produce errors when used with NDB tables, as described in the following list: Temporary ...
https://dev.mysql.com/doc/refman/8.4/en/precision-math-expressions.html
By default, division by zero produces a result of NULL and no warning. sql_mode Value Result '' (Default) No warning, no error; i is set to NULL. With precision math, exact-value numbers are used as given whenever possible. For example, numbers in ...