Eine Einführung in

SQL

Problem

We want to filter the results returned based on an aggregate function such as COUNT or SUM.

The WHERE clause may not be used for this. The WHERE conditions are considered before the aggregation.

Solutions

• Put the condition into the HAVING clause, after the GROUP BY clause.

SELECT winner FROM nobel
  GROUP BY winner
  HAVING COUNT(winner)>1

Problem

We want to filter the results returned based on an aggregate function such as COUNT or SUM.

The WHERE clause may not be used for this. The WHERE conditions are considered before the aggregation.

Solutions

• Put the condition into the HAVING clause, after the GROUP BY clause.

SELECT winner FROM nobel
  GROUP BY winner
  HAVING COUNT(winner)>1

Problem

We want to filter the results returned based on an aggregate function such as COUNT or SUM.

The WHERE clause may not be used for this. The WHERE conditions are considered before the aggregation.

Solutions

• Put the condition into the HAVING clause, after the GROUP BY clause.

SELECT winner FROM nobel
  GROUP BY winner
  HAVING COUNT(winner)>1

Problem

We want to filter the results returned based on an aggregate function such as COUNT or SUM.

The WHERE clause may not be used for this. The WHERE conditions are considered before the aggregation.

Solutions

• Put the condition into the HAVING clause, after the GROUP BY clause.

SELECT winner FROM nobel
  GROUP BY winner
  HAVING COUNT(winner)>1

Problem

We want to filter the results returned based on an aggregate function such as COUNT or SUM.

The WHERE clause may not be used for this. The WHERE conditions are considered before the aggregation.

Solutions

• Put the condition into the HAVING clause, after the GROUP BY clause.

SELECT winner FROM nobel
  GROUP BY winner
  HAVING COUNT(winner)>1

Problem

We want to filter the results returned based on an aggregate function such as COUNT or SUM.

The WHERE clause may not be used for this. The WHERE conditions are considered before the aggregation.

Solutions

• Put the condition into the HAVING clause, after the GROUP BY clause.

SELECT winner FROM nobel
  GROUP BY winner
  HAVING COUNT(winner)>1

Problem

We want to filter the results returned based on an aggregate function such as COUNT or SUM.

The WHERE clause may not be used for this. The WHERE conditions are considered before the aggregation.

Solutions

• Put the condition into the HAVING clause, after the GROUP BY clause.

SELECT winner FROM nobel
  GROUP BY winner
  HAVING COUNT(winner)>1

Problem

We want to filter the results returned based on an aggregate function such as COUNT or SUM.

The WHERE clause may not be used for this. The WHERE conditions are considered before the aggregation.

Solutions

• Put the condition into the HAVING clause, after the GROUP BY clause.

SELECT winner FROM nobel
  GROUP BY winner
  HAVING COUNT(winner)>1

Problem

We want to filter the results returned based on an aggregate function such as COUNT or SUM.

The WHERE clause may not be used for this. The WHERE conditions are considered before the aggregation.

Solutions

• Put the condition into the HAVING clause, after the GROUP BY clause.

SELECT winner FROM nobel
  GROUP BY winner
  HAVING COUNT(winner)>1