SQL Server BasicsWhat is SQL Server database?What is RDBMS?What is Normalization?Why we use Denormalization?What_is_SQL?What is PL/SQL?Difference between SQL and PL/SQLDatabase TableOne to One RelationshipOne to Many RelationshipMany to Many RelationshipMany to One RelationshipString Data TypesNumber Data TypesDate Data TypesOther Data TypesCreate DatabaseDrop DatabaseCreating and Managing Users in SQL ServerCreate TableAlter TableDrop TableConstraints in SQL serverPrimary KeyForeign KeyUnique KeyCandidate KeyComposite KeyDifference between primary key and candidate keyPrimary key and foreign key relationshipSurrogate KeyCascading Referential Integrity ConstraintsSelf Referential Integrity ConstraintsInsert into statementInsert multiple recordsUpdate statementDelete statementTruncate statementDifference between Delete and TruncateAlias in SQL ServerSelect statementSelect DistinctSelect TopSelect IntoNull Functions(ISNULL(),NULLIF(),COALESCE())Sub QueryIdentity ColumnSequence objectDifference between sequence and identity columnSQL Server ClausesWHERE ClauseOrder By ClauseTop N ClauseGroup By ClauseHaving ClauseDifference between Where and HavingSQL Server OperatorsArithmetic OperatorsComparison OperatorsLogical OperatorsBitwise OperatorsAny OperatorsAll OperatorsUnion OperatorsUnion All OperatorsDifference between Union and Union AllIntersect OperatorExcept OperatorDifference between Except and IntersectJoinsInner JoinLeft JoinRight JoinFull JoinSelf JoinCross JoinViewsWhat are views?Create views using SSMSIndexed ViewsComplex ViewsCheck Option in ViewCheck Encryption in ViewSchema Binding Option in ViewRead-only ViewsUpdatable ViewsAdvantages and disadvantages of viewsCreate multiple views on one tableCan we implement index on views?Can we Perform Insert, update, delete operation on views?Stored Procedure and FunctionsWhat are Stored Procedures?Why we use stored procedures?Passing parameters to Stored procedureUser-Defined FunctionsDifference between UDF and Stored procedurePre-Defined Functions@@Indentity and Scope_IndentityNULLIF, ISNULL and COALESCE
Previous
Next

SQL - Difference between Where and Having

The main difference between the WHERE and HAVING clauses in SQL lies in their usage and the data they filter.

1. Usage:

•WHERE: The WHERE clause is used in SELECT, UPDATE, DELETE, or INSERT statements to filter individual rows based on specified conditions. It operates on individual rows before any grouping or aggregation takes place.
•HAVING: The HAVING clause is used specifically with the GROUP BY clause to filter groups of data based on specified conditions. It operates on aggregated values after the grouping has occurred.

2. Data Filtered:

•WHERE: The WHERE clause filters individual rows based on conditions specified in the query. It can filter data on any column, including both aggregated and non-aggregated columns.
•HAVING: The HAVING clause filters groups of data based on conditions applied to aggregated values. It can only filter on aggregated columns or expressions derived from aggregated columns.

3. Placement:

•WHERE: The WHERE clause appears before the GROUP BY clause (if used) in a query. It filters rows before any grouping or aggregation is applied.
•HAVING: The HAVING clause appears after the GROUP BY clause in a query. It filters groups of data after the grouping and aggregation have occurred.

In summary, the WHERE clause filters individual rows based on specified conditions, while the HAVING clause filters groups of data based on conditions applied to aggregated values. The WHERE clause is used before any grouping or aggregation, whereas the HAVING clause is used after the grouping and aggregation have taken place.

Previous
Next
Advertisement Advertise Here