In SQL, the GROUP BY clause can be used to divide the results of a query into groups of rows.
This is usually done in order to perform one or more aggregations on each group.
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SQL ORDER BY Clause for Beginners
The ORDER BY clause is commonly used in SQL to sort the results of a query.
It allows you to specify the order in which the results are returned.
You can specify whether the results are sorted in ascending order or descending order. You can also specify multiple columns for sorting.
Continue readingSQL Greater Than (>) Operator for Beginners
In SQL, the greater than operator (>) compares two expressions and returns TRUE if the left operand has a value higher than the right operand; otherwise, it returns FALSE.
SQL Greater Than or Equal To (>=) Operator for Beginners
In SQL, the greater than or equal to operator (>=) compares two expressions and returns TRUE if the left operand has a value greater than or equal to the right operand; otherwise, it returns FALSE.
SQL Less Than or Equal To (<=) Operator for Beginners
In SQL, the less than or equal to operator (<=) compares two expressions and returns TRUE if the left operand has a value lower than or equal to the right operand; otherwise, the result is FALSE.
You can use it to determine whether a value is less than or equal to another value.
Continue readingSQL Less Than (<) Operator for Beginners
In SQL, the less than operator (<) compares two expressions and returns TRUE if the left operand has a value lower than the right operand; otherwise, the result is FALSE.
SQL Not Equal To (<>) Operator for Beginners
In SQL, the not equal to operator (<>) compares the non-equality of two expressions. That is, it tests whether one expression is not equal to another expression.
If either or both operands are NULL, NULL is returned.
SQL also has another not equal to operator (!=), which does the same thing. Which one you use may depend on your DBMS, which one you’re the most comfortable using, and perhaps also whether your organisation has any coding conventions that dictate which one should be used.
SQL Not Equal To (!=) Operator for Beginners
In SQL, the not equal to operator (!=) compares the non-equality of two expressions. That is, it tests whether one expression is not equal to another expression.
If either or both operands are NULL, NULL is returned.
SQL also has another not equal to operator (<>), which does the same thing. Which one you use may depend on your DBMS, which one you’re the most comfortable using, and perhaps also whether your organisation has any coding conventions that dictate which one should be used.
SQL Equals (=) Operator for Beginners
The equals operator (=) is probably the most commonly used operator in SQL. It compares the equality of two expressions. Even if you’ve only just begun your SQL journey, you’ll probably know this operator.
SQL NOT Operator for Beginners
In SQL, the NOT operator negates a Boolean input (it reverses the value of any Boolean expression). Therefore it returns TRUE when the expression is FALSE.