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SQL – Exists
SQL Exists Keyword Table Of Contents: What Is SQL Exists Keyword? Syntax Of SQL Exists. Examples Of SQL Exists. (1) What Is SQL Exists Keyword? The EXISTS operator is used to look for the existence of a row in a given table that satisfies a set of criteria. It is a Boolean operator that compares the result of the subquery to an existing record and returns true or false. The returned value is true, if the subquery fetches single or multiple records and false if no record is matched. It is used in the combination of the subquery and checks
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SQL – Having
SQL Having Keyword Table Of Contents: What Is SQL having Keyword? Syntax Of SQL Having? Examples Of SQL Having. (1) What Is SQL Having Keyword? SQL HAVING clause is similar to the WHERE clause; they are both used to filter rows in a table based on conditions. However, the HAVING clause was included in SQL to filter grouped rows instead of single rows. These rows are grouped together by the GROUP BY clause, so, the HAVING clause must always be followed by the GROUP BY clause. It can be used with aggregate functions, whereas the WHERE clause cannot. (2) Syntax Of
