What's difference between MySql IN and ANY operator? There is 2 differences between them. IN is an operator whereis ANY is not, it is a keyword and may be treated as a comparison operator modifier (the same for ALL and SOME). See Operators and Operator Precedence. IN is listed in bot...
In a WHERE clause, column=null will never be true, it is not valid to use null this way, you need to say column IS NULL or column IS NOT NULL. This speaks to the special nature of NULL, it is not a value to check for equality of, it is an unknown value, so you need to use...
The engine has opted not to use the index, maybe the != operation is not quite as simple as = in this case, and therefore it makes sense to predict that every row will be visited The engine has, however, made a fairly accurate prediction on how many of these visi...
This option allows you to create a dump from a MySQL 8.2 or newer server that is compatible with older versions of MySQL; its value, one of those listed here, determines the compatibility of replication terminology used in the dump: SERVER: Gets the version of the server and uses the ...
For similar information about NDB Cluster 7.5, see What is New in NDB Cluster 7.5. NDB Cluster 7.4 and 7.3 were previous GA releases which have reached their end of life, and which are no longer supported or maintained. We recommend that new deployments for production use MySQL NDB Cluster ...
In MySQL's table INFORMATION_SCHEMA.TABLES, there's a column named 'TABLE_CATALOG'. The documentation is sparse on this column and I'm wondering what the heck is the purpose of this? Any killer-app purpose or something that I'm missing? mysql> SHOW CREATE TABLE INFORMATION...
How to check string array is not null in C# How to check the date range in where clause using case statements in SQL Server. How to check the givem email address exists or not? how to check Var is empty or null in Linq How to check when and who started the Windows service. How ...
MySQL 8.0 deliversGROUPING(),SQL_FEATURE T433. TheGROUPING()function distinguishes super-aggregate rows from regular grouped rows.GROUP BYextensions such asROLLUPproduce super-aggregate rows where the set of all values is represented by null. Using theGROUPING()function, you can distinguish a null ...
2 rows in set (0.10 sec) mysql> Now in the EXPLAIN plan in the "ref" there is the value as "func". I want to understand what exactly "func" in this case means and some details regarding this value. Thanks in advance. Subject ...
As of MySQL 8.0.16, the server performs the tasks previously handled by mysql_upgrade. After installation of a new MySQL version, the server now automatically performs all necessary upgrade tasks at the next startup and is not dependent on the DBA invoking mysql_upgrade. In addition, the serv...