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Hope this post finds you in good health and spirit.

Structured Query Language, abbreviated as SQL, is a domain-specific language used in programming and designed for managing data held in a relational database management system, or for stream processing in a relational data stream management system.

An good developer must be familiar with a few commands in SQL because it is such a strong development tool. The SQL queries listed below are important for coding and optimization. Almost every system that interacts with a SQL database will be affected by each query in the SQL tutorial.

Returning a Column of Unique Values

Now, suppose that our data entry operator added the same Customers to the Customers table more than once by mistake. As you know, proper indexing requires that the key field contains only unique values. To fix the problem, we will use SELECT DISTINCT to create an indexable list of unique customers:

SELECT DISTINCT ID FROM Customers

So, that’s all in this blog. I will meet you soon with next stuff .Have a nice day !!!

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