SQL WHERE AND, OR, NOT Clause [SQL Operators]

The SQL “NOT” clause is used with “WHERE” conditions.

The “AND”, “OR” and “NOT” operators are used to test two or more conditions in a SELECT, INSERT, UPDATE, or DELETE statements.

The “WHERE” clause with “AND” operator requires that two conditions are true and an “OR” requires that one of two conditions is true and the “NOT” negates the specified condition.

Stayed Informed - 37 Best SQL Server Interview Questions and Answers

Syntax:-

--THE WHERE WITH AND OPERATOR 
SELECT ColumnName, ColumnName
  FROM TableName  WHERE Condition1 AND Condition2

--THE WHERE WITH OR OPERATOR
UPDATE TableName
   SET ColumnName = value
WHERE Condition1 OR Condition2

--THE WHERE WITH NOT OPERATOR
DELETE TableName
WHERE NOT Condition1

Examples:-

--SELECT ALL COUNTRIES
SELECT [Id]
      ,[CountryName]
      ,[CountryCode]
  FROM [test].[dbo].[Countries]

Result:-

Id CountryName CountryCode
-------------------------------------
1 India         IN
2 Nepal         NP
3 USA         US
4 Rasia         NULL
5 Australia AUS

Example :-

-- SELECT ALL MATCHED CONDITIONS COUNTRIES
SELECT [Id]
      ,[CountryName]
      ,[CountryCode]
  FROM [test].[dbo].[Countries]
  WHERE (CountryCode = 'IN' AND Id <> 2) OR  (CountryCode = 'US' AND Id <> 2)

Result :-

Id CountryName CountryCode
-----------------------------------
1 India         IN
3 USA         US

Stayed Informed - SQL Server Query and Examples

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