What is DECLARE and set in SQL?

Question

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. Literals, expressions, the result of a query, and special register values can be assigned to variables.

What is the difference between set and DECLARE in SQL?

When you declare it you declare the variable name, the type, and a default value, which could be an expression. SET is for initializing the variable you declared previously, and you cannot SET the variable until you DECLARE it.

What is DECLARE in SQL?

The DECLARE statement initializes a variable by assigning it a name and a data type. The variable name must start with the @ sign. In this example, the data type of the @model_year variable is SMALLINT . By default, when a variable is declared, its value is set to NULL .

What is DECLARE in database?

Declares the name of a database.

What is set clause in SQL?

After you add a table to an UPDATE statement in the SQL Query Builder, you can create a SET clause. The SET clause specifies the columns to update and the new values for the columns.

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