SQL
SQL Aggregate Functions
What Are SQL Aggregate Functions? SQL aggregate functions perform calculations on a set of values and return a single value. These functions are comm…
SQL
SQL INNER JOIN
Understanding SQL INNER JOIN The SQL INNER JOIN is a type of join that retrieves records from two or more tables based on a related column. It ret…
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SQL LEFT JOIN
Understanding SQL LEFT JOIN The SQL LEFT JOIN (or LEFT OUTER JOIN ) retrieves all records from the left table (first table) and the matched records …
SQL
SQL FULL OUTER JOIN
Understanding SQL FULL OUTER JOIN The SQL FULL OUTER JOIN retrieves records from both the left and right tables. It returns all rows when there is a…
SQL
SQL IS NULL
Understanding SQL IS NULL In SQL, the IS NULL operator is used to check if a value in a column is NULL . A NULL value represents missing, undefined…
SQL
SQL NOT Operator
Understanding the SQL NOT Operator The SQL NOT operator is used to negate a condition in a query. It is a logical operator that returns TRUE if th…
SQL
SQL IN
What is the SQL IN Operator? The IN operator in SQL is used to filter rows based on whether a column value matches any value in a specified list. I…
SQL
SQL LIKE
What is the SQL LIKE Operator? The LIKE operator in SQL is used to search for a specified pattern in a column. It is commonly used in WHERE clause…
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SQL Logical Operators
What are SQL Logical Operators? SQL Logical Operators are used to combine multiple conditions in a query WHERE or HAVING clause to refine the data …
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SQL AND
What is the SQL AND Operator? The AND operator in SQL is a logical operator used in the WHERE or HAVING clause to combine two or more conditions.…
SQL
SQL OR
What is the SQL OR Operator? The SQL OR operator is a logical operator used to combine two or more conditions in an WHERE or HAVING clause. It …
SQL
SQL BETWEEN
What is the SQL BETWEEN Operator? The BETWEEN operator in SQL is used to filter rows based on a range of values. It is often used in the WHERE or …
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SQL Comparison Operators
SQL Comparison Operators
SQL
SQL LIMIT
Understanding SQL LIMIT The SQL LIMIT clause is used to restrict the number of rows returned by a query. It is particularly useful when working with…
SQL
SQL FETCH
Understanding SQL FETCH The SQL FETCH clause is used to retrieve a specific number of rows from a query result. It is often combined with the OFFSET…
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SQL WHERE
Understanding SQL WHERE Clause The SQL WHERE clause is used to filter records in a database table based on specific conditions. It allows you to re…
SQL
SQL DISTINCT
Understanding SQL DISTINCT The SQL DISTINCT keyword is used to remove duplicate rows from the result set of a query. It ensures that only unique val…
SQL
SQL SELECT
Understanding SQL SELECT The SQL SELECT statement is used to retrieve data from one or more tables in a database. It is one of the most fundamental …
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SQL ORDER BY
Understanding SQL ORDER BY Clause The SQL ORDER BY clause is used to sort the result set of a query based on one or more columns. By default, it so…
SQL
SQL Sample Database
SQL Sample Database A sample database is a simplified dataset used to demonstrate SQL concepts like creating tables, querying data, applying constrai…
