NON-EQUIJOIN

Function

This statement is used to join multiple tables using unequal values and return the result set that meet the condition.

Syntax

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SELECT attr_expr_list FROM table_reference
  JOIN table reference ON non_equi_join_condition;

Keyword

The non_equi_join_condition is similar to join_condition. The only difference is that the JOIN condition is inequation.

Precautions

The to-be-joined table must exist. Otherwise, an error is reported.

Example

To return all the pairs of different student names from the student_info_1 and student_info_2 tables, run the following statement:

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SELECT student_info_1.name, student_info_2.name FROM student_info_1
  JOIN student_info_2 ON (student_info_1. name <> student_info_2. name);