[PDF] aggregate functions in sql with where condition

11 août 2022 · Aggregate functions are not allowed because the WHERE clause is used for filtering data before aggregation. So while WHERE isn't for aggregation  Autres questions
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  • Can we use WHERE condition in aggregate function in SQL?

    Aggregate functions are not allowed because the WHERE clause is used for filtering data before aggregation. So while WHERE isn't for aggregation, it has other uses. To filter data based on an aggregate function result, you must use the HAVING clause.11 août 2022

  • Can we use aggregate function with WHERE clause?

    An aggregate function can be used in a WHERE clause only if that clause is part of a subquery of a HAVING clause and the column name specified in the expression is a correlated reference to a group. If the expression includes more than one column name, each column name must be a correlated reference to the same group.

  • Can aggregate functions only be used in SELECT clause or HAVING clause?

    Aggregate functions can be used only in SELECT or HAVING clauses. GROUP BY dept; The above SELECT statement specifies two columns, dept and emp_age, but only emp_age is referenced by the aggregate function, AVG. The dept column must be specified in the GROUP BY clause.
  • The Where clause is helpful in the SQL Statements Select, Update, Delete for filtering data satisfying a specific condition. The following SQL query retrieves all data stored in the [SalesLT]. [SalesOrderDetail] table. As shown below, it retrieves 540 records.
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questions with aggregation involving grouping (GROUP BY clause) and aggregation functions such as count sum