PostgreSQL - Add (+) Operator

The PostgreSQL + (add) operator is used to add two values. It operates on numerical values.

The example below describes how to use add 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 sum of Var1 and Var2 column values is greater than 25, the query is given below:

  SELECT * FROM Sample
  WHERE Var1 + Var2 > 25;
  

  
  

  The query will produce following result:

  Data	Var1	Var2
  Data4	25	4
  Data5	30	5
  Data6	35	6

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

  SELECT *, (Var1 + Var2) AS SUM FROM Sample;
  

  
  

  The query will produce following result:

  Data	Var1	Var2	SUM
  Data1	10	1	11
  Data2	15	2	17
  Data3	20	3	23
  Data4	25	4	29
  Data5	30	5	35
  Data6	35	6	41

• Using with UPDATE Clause: To update the column Var1 with the sum 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	11	1
  Data2	17	2
  Data3	23	3
  Data4	29	4
  Data5	35	5
  Data6	41	6

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

  SELECT 30 + 50;
  

  
  

  The query will produce following result:

  80
  
  (1 row)