Question

the where clause is always processed before the group by clause when both occur in a select statement. t/f

Answer 1

The WHERE clause is always processed before the GROUP BY clause when both occur in a SELECT statement is true.

In database management, the SELECT statement refers to the query data in the database. The SELECT statement, or command enables the user to extract data from tables, based on specific criteria. It is processed starts according to the following sequence: SELECT DISTINCT item(s); FROM  table(s); WHERE  predicate; GROUP BY  field(s); ORDER BY fields. Hence, a processing order starts from FROM clause to get the table names, then restricting rows using WHERE clause, grouping them using GROUP BY clause, restricting groups using HAVING clause. ORDER BY clause is the last one to be processed to sort the final data set.

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