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What is Equi-Join in database? What is a CLAUSE in terms of S

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What is Equi-Join in database? What is a CLAUSE in terms of S

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  1. Equi-Join in Database: Equi-Join is a type of join in database that combines two tables based on the equality between the values of columns from both the tables. It uses a comparison operator (=) to match rows from two tables based on the column values. It returns only the matched rows from both the tables.

For example, if we have two tables, 'Students' and 'Courses', and we want to find out which student is enrolled in which course, we can use an equi-join on the 'student_id' column (which is common in both tables) to get the desired result.

  1. Clause in SQL: In SQL (Structured Query Language), a clause is a part of a SQL statement. It is used to filter or manipulate data in different ways. Some of the common SQL clauses include 'WHERE', 'AND', 'OR', 'NOT', 'FROM', 'ORDER BY', 'GROUP BY', 'HAVING', etc.

For example, the 'WHERE' clause is used to filter the results of a SQL query, so that only the rows that meet certain criteria are returned. The 'GROUP BY' clause is used to group rows that have the same values in specified columns into aggregated data.

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