When you do "GROUP BY id_magasin, id_produit", MySQL needs to get the rows in (id_magasin,id_produit) order. To do that, MySQL can read from a multiple keypart index where (id_magasin, id_produit) are the *first* keyparts. Otherwise, MySQL has to order the result before grouping...
The function of aGROUP BYstatement is to group records with shared values. AGROUP BYstatement is always used with an aggregate function in a query. As you may recall, an aggregate function summarizes information and returns a single result. For instance, you can query for the total count or...
_mysql_connector.MySQLInterfaceError: The MySQL server is running with the --super-read-only option so it cannot execute this statement Transactions Now we’re going to play with transactions. We create a new script that will perform several transactions: a read operation in autocommit a read op...
In MySQL HeatWave Database Service, there is one extra privilege (as in MySQL Enterprise Edition):TP_CONNECTION_ADMIN You can see that a new user doesn’t have access to the test database anymore: mysql> use test; ERROR 1044 (42000): Access denied for user ‘user1’@’%’ to database...
This is an overview of the cluster in MySQL Shell: Copy code snippet Copied to Clipboard Error: Could not Copy Copied to Clipboard Error: Could not Copy JS>cluster.status(){"clusterName":"fred","defaultReplicaSet":{"name":"default","primary":"127.0.0.1:3310","ssl":"REQUIRED","status...
MySqlConnection cannot be cast to [B]MySQL.Data.MySqlClient.MySqlConnection. [C#] How to make the Console Process delay [C#] Oracle.DataAccess issue - Unhandled exception of type System.TypeInitializationException occured in mscorlib.dll [C#] Regex - Best Validation of Domain? [C#] Upload ...
This tutorial explains the steps to Create a Database in MySQL with syntax and examples. Also includes how to delete a database with example.
--Back up the files in SalesGroup1. BACKUP DATABASE Sales FILEGROUP = 'SalesGroup1', FILEGROUP = 'SalesGroup2' TO DISK = 'C:\MySQLServer\Backups\Sales\SalesFiles.bck' GO WITH DIFFERENTIAL, GO
don’t know which connection is causing metadata lock, then you have to kill all the Sleep queries which are in mysql for more than a certain time. As we know “kill thread_id” is not permitted in RDS, but you can use the query below to get the exact queries to kill Sleep threads...
I try since several days to improve the speed of the following query: SELECT id_magasin, id_produit, SUM(int_qte_vendue) FROM dwh.etl_vente WHERE int_date BETWEEN 1148 AND 1178 AND id_magasin IN (6, 2, 9, 5, 31) GROUP BY 1, 2; ...