PostgreSQL - Multiply (*) Operator

The PostgreSQL * (multiply) operator is used to multiply two values. It operates on numerical values.

The example below describes how to use multiply operator in various conditions:

Example:

Consider a database table called Sample with the following records:

• Using with WHERE Clause: To select records of table where multiplication of Var1 and Var2 column values is greater than 100, the query is given below.

  SELECT * FROM Sample
  WHERE Var1 * Var2 > 100;
  

  
  

  The query will produce following result:

  Data	Var1	Var2
  Data5	30	5
  Data6	35	6

• Using with AS Clause: The product of Var1 and Var2 column values can be displayed in a different column using AS clause:

  SELECT *, (Var1 * Var2) AS Prod FROM Sample;
  

  
  

  The query will produce following result:

  Data	Var1	Var2	Prod
  Data1	10	1	10
  Data2	15	2	30
  Data3	20	3	60
  Data4	25	4	100
  Data5	30	5	150
  Data6	35	6	210

• Using with UPDATE Clause: To update the column Var1 with the product of columns Var1 and Var2, the query is given below:

  UPDATE Sample
  SET Var1 = Var1 * Var2;
  
  --See result
  SELECT * FROM Sample;
  

  
  

  The query will produce following result:

  Data	Var1	Var2
  Data1	10	1
  Data2	30	2
  Data3	60	3
  Data4	100	4
  Data5	150	5
  Data6	210	6

• Using with values: To multiply two values, we can simply use SELECT statement:

  SELECT 50 * 30;
  

  
  

  The query will produce following result:

  1500
  
  (1 row)