How do you check if a record exists or not in MySQL?
Besides, how do you check if data is present in database?
To check whether a particular value exists in the database, you simply have to run just a regular SELECT query, fetch a row and see whether anything has been fetched. Here we are selecting a row matching our criteria, then fetching it and then checking whether anything has been selected or not.
Furthermore, what is Upsert query? From Wikipedia, the free encyclopedia. A relational database management system uses SQL MERGE (also called upsert) statements to INSERT new records or UPDATE existing records depending on whether condition matches. It was officially introduced in the SQL:2003 standard, and expanded in the SQL:2008 standard.
Similarly one may ask, does not exist in MySQL?
[NOT] EXISTS(subquery); In other words, the NOT EXISTS returns true if the subquery returns no row, otherwise it returns false. Note that you can use SELECT * , SELECT column , SELECT a_constant , or anything in the subquery. The results are the same because MySQL ignores the select list appeared in the SELECT clause.
How can we avoid insert duplicate records in SQL Server?
How to prevent insert duplicate in SQL Server
- USE [DhipayaHQDB_Test]
- /****** Object: StoredProcedure [dbo].[spInsertMotorInsuranceShortTerm_transaction] Script Date: 8/9/2017 4:19:46 PM ******/
- SET ANSI_NULLS ON.
- SET QUOTED_IDENTIFIER ON.
- -- =============================================