Useful tips for everyday
How would you delete records using delete query? Just open the table in Datasheet view, select the fields (columns) or records (rows) that you want…
Which command is used to remove unwanted data from the table? To remove a row from a table is accomplished through a Data Manipulation Language,…
How difficult is PostgreSQL? PostgreSQL has very exhaustive and detailed documentation. Although tough on the beginner – it is hard to find an easy entry…
How connect Postgres database to EC2? Having connected to the EC2 instance, connect to PostgreSQL database instance postgres that is running on the EC2 instance…
What should be the priority of member to prevent them from becoming primary in replication in MongoDB? MongoDB does not permit the current primary to…
Why do we need encryption in PostgreSQL database? Encryption Options. PostgreSQL offers encryption at several levels, and provides flexibility in protecting data from disclosure due…
How do you unlock a table in PostgreSQL? PostgreSQL – how to unlock table record AFTER shutdown Insert row in TABLE A. Lock this record.…
Can there be multiple minimal covers? So we have 4 possible minimal covers: b->c, g->c OR g->e, b->d OR b->g, g->b, e->a . The correct…
How do you prevent duplicates in MySQL table? Note − Use the INSERT IGNORE command rather than the INSERT command. If a record doesn’t duplicate…
How does a Clustered index get fragmented? Fragmentation is simply out of order pages in the b-tree which are caused by page splits. When you…