Why is declare used in SQL?

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Manoj Kumar Vishwakarma

MS SQL SERVER DBA Trainer

Variables in SQL procedures are defined by using the DECLARE statement. Values can be assigned to variables using the SET statement or the SELECT INTO statement or as a default value when the variable is declared. ... You can also assign the result of a GET DIAGNOSTICS statement to a variable.
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How to refresh knowledge of .Net,SOL.. I have done GNIIT course from NIIT in MIS track. There I have learnt .Net Crystal Reports,SQL. Now I am not using .Net Crystal Reports and SQL in my current profile of my JOB. Because of some reason I am working in operations and not in IT. I again want to move back to IT. So I want to develop those skills which I have learnt it earlier. Compare to earlier now the versions are changed... I need an advise from Teachers & Trainers.
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