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SQL Join Row Counts
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SQL Join Row Counts

MediumSQL · PostgreSQL

Problem

What is the minimum and maximum number of rows returned from each of the four main SQL join types for a table with 100 rows and another with 10 rows?

Use the provided cardinality inputs and assume an arbitrary equality condition, with duplicate matches allowed and no uniqueness or foreign-key constraints. Return one row for each join type.

Output

  1. Columns: join_type, min_rows, and max_rows
  2. Include INNER, LEFT, RIGHT, and FULL OUTER joins
  3. Order by the standard sequence: INNER, LEFT, RIGHT, FULL OUTER

Schema

join_cardinality_inputs
ColumnTypeDescription
input_idPKINTIdentifier for the cardinality input
table_nameVARCHAR(50)Logical name of the relation
row_countINTNumber of rows in the relation
notesVARCHAR(100)Optional metadata about the input
Tablesjoin_cardinality_inputs
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