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Explain group By clause in SQL?
Group By clause in SQL: The GROUP BY clause can be used in a SELECT statement to collect data across multiple records and group the results through one or more columns.
The syntax for the GROUP BY clause is:
SELECT column1, column2, ... column_n, aggregate_function (expression)FROM tablesWHERE predicatesGROUP BY column1, column2, ... column_n; aggregate_function could be a function like as SUM, COUNT, MIN, or MAX.
What are stored and derived attributes? Stored attributes: The attributes keeps in a data base are known as stored attributes. Derived attributes: The attributes that are de
To eliminate duplicate rows (distinct operator) Example: SELECT DISTINCT DEPTNO FROM EMP;
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explain the steps for reduction of er model into relational model?
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Prepare a data flow diagram for computing the volume and surface area of a cylinder. Inputs are the height and radius of the cylinder. Outputs are the volume and surface area of th
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