Useful tips for everyday
How does order by Index work in PostgreSQL? This allows a query’s ORDER BY specification to be honored without a separate sorting step. Of the…
What are the problems with cursor inside Stack Overflow? Main problem is about changing the index of rows to 1,2,3.. where contact-id and type is…
How do you replicate a snapshot in SQL Server? Step 1: Launch your SSMS (SQL Server Management Studio) and login to your Publisher server. Step…
Does MySQL use multiple indexes? Yes, MySQL can use multiple index for a single query. The optimizer will determine which indexes will benefit the query.…
How to use sys.dm.os performance counters in SQL Server? sys.dm_os_performance_counters (Transact-SQL) Returns a row per performance counter maintained by the server. For information about each…
Is the InnoDB flush method O _ DIRECT or O _ dsync? Where InnoDB data and log files are located on a SAN, it has…
Which join is best in MySQL? There is not a “better” or a “worse” join type. They have different meaning and they must be used…
How is centroid picked in K-means? The k-means clustering algorithm attempts to split a given anonymous data set (a set containing no information as to…
How do you calculate cohort analysis? Perform your own cohort analysis Step 1: Pull the raw data. Typically, the data required to conduct cohort analysis…
How do I create my own SAS library? You can create SAS libraries using a point-and-click interface. Click View. Explorer. Click File. New. In the…