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https://dev.mysql.com/doc/refman/5.7/en/show-warnings.html
mysql> CREATE TABLE t1 (a TINYINT NOT NULL, b CHAR(4)); Query OK, 0 rows affected (0.05 sec) mysql> INSERT INTO t1 VALUES(10,'mysql'), (NULL,'test'), (300,'xyz'); Query OK, 3 rows affected, 3 warnings (0.00 sec) Records: 3 Duplicates: 0 Warnings: 3 ... SHOW WARNINGS [LIMIT [offset,] row_count] SHOW COUNT(*) WARNINGS SHOW WARNINGS is a diagnostic statement that displays information about the conditions (errors, warnings, and notes) resulting from executing a statement in the current ...
https://dev.mysql.com/doc/refman/5.7/en/spatial-relation-functions-object-shapes.html
If g1 is a Polygon or a MultiPolygon, or if g2 is a Point or a MultiPoint, the return value is NULL. Returns NULL if g1 is a Polygon or a MultiPolygon, or if g2 is a Point or a MultiPoint. If either argument is NULL or an empty geometry, the return ... The OpenGIS specification defines the following functions to test the relationship between two geometry values g1 and g2, using precise object ...
https://dev.mysql.com/doc/refman/5.7/en/x-plugin-options-system-variables.html
mysqlx_ssl_ca Command-Line Format --mysqlx-ssl-ca=file_name System Variable mysqlx_ssl_ca Scope Global Dynamic No Type File name Default Value NULL The mysqlx_ssl_ca system variable is like ssl_ca, except that it applies to X Plugin rather than the ... To control activation of X Plugin, use this option: --mysqlx[=value] Command-Line Format --mysqlx[=value] Type Enumeration Default Value ON Valid Values ONOFFFORCEFORCE_PLUS_PERMANENT This option controls how the server loads X Plugin at ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-introduction.html
In some cases (for example, the ROUTINE_DEFINITION column in the INFORMATION_SCHEMA ROUTINES table), users who have insufficient privileges see NULL. If this field is NULL, it means that the value of the column is always NULL. INFORMATION_SCHEMA ...
https://dev.mysql.com/doc/refman/5.7/en/create-tablespace.html
The precise syntax and semantics depend on the storage engine used. In standard MySQL 5.7 releases, this is always an InnoDB tablespace. MySQL NDB Cluster 7.5 also supports tablespaces using the NDB storage engine in addition to those using InnoDB.
https://dev.mysql.com/doc/refman/5.7/en/cost-model.html
Any non-NULL cost estimate specified in the tables takes precedence over the corresponding compiled-in default cost constant. Any NULL estimate indicates to the optimizer to use the compiled-in default. It is also easy to revert to a default by ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-trx-table.html
TRX_REQUESTED_LOCK_ID The ID of the lock the transaction is currently waiting for, if TRX_STATE is LOCK WAIT; otherwise NULL. TRX_WAIT_STARTED The time when the transaction started waiting on the lock, if TRX_STATE is LOCK WAIT; otherwise NULL. The ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-triggers-table.html
This is a TIMESTAMP(2) value (with a fractional part in hundredths of seconds) for triggers created in MySQL 5.7.2 or later, NULL for triggers created prior to 5.7.2. To see information about a table's triggers, you must have the TRIGGER privilege ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-memcached-ddl.html
You can access the underlying InnoDB table (which is test.demo_test by default) through standard SQL interfaces. However, there are some restrictions: When querying a table that is also accessed through the memcached interface, remember that ...
https://dev.mysql.com/doc/refman/5.7/en/numeric-type-attributes.html
When you insert a value of NULL into an indexed AUTO_INCREMENT column, the column is set to the next sequence value. (AUTO_INCREMENT sequences begin with 1.) Storing 0 into an AUTO_INCREMENT column has the same effect as storing NULL, unless the ...