Difference Between SQL in, SQL Exists and SQL Joins

Опубликовано: 06 Январь 2020
на канале: Ashish Thakur

1,247

SQL IN, EXISTS and SQL joins works differently in different cases. For eg: EXISTS is much faster than IN when the subquery result is very large, the exists operator provides a better performance. IN is faster than EXISTS when the sub query results are small. the EXISTS keyword evaluates true or false, but IN keyword compare all value in the corresponding sub query column. Infact, Exists is the only used to test if a subquery returns results, and short circuits as soon as it does. JOIN is used to extend a result set by combining it with additional fields from another table to which there is a relation.

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#SQL_IN #SQL_Exits #SQL_Joins