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A GROUP BY statement in SQL specifies that a SQL SELECT statement partitions result rows into groups, based on their values in one or several columns. Typically, grouping is used to apply some sort of aggregate function for each group.
SQL includes operators and functions for calculating values on stored values. SQL allows the use of expressions in the select list to project data, as in the following example, which returns a list of books that cost more than 100.00 with an additional sales_tax column containing a sales tax figure calculated at 6% of the price.
The CASE expression, for example, enables SQL to perform conditional branching within queries, providing a mechanism to return different values based on evaluated conditions. This logic can be particularly useful for data transformation during retrieval, especially in SELECT statements.
In a SQL database query, a correlated subquery (also known as a synchronized subquery) is a subquery (a query nested inside another query) that uses values from the outer query. This can have major impact on performance because the correlated subquery might get recomputed every time for each row of the outer query is processed.
In a SQL database, a record is typically called a "row". The introduction of granular (subset) locks creates the possibility for a situation called deadlock. Deadlock is possible when incremental locking (locking one entity, then locking one or more additional entities) is used. To illustrate, if two bank customers asked two clerks to obtain ...
Bill Gates details his early relationship with Steve Ballmer in his new "Source Code" memoir. Ballmer mirrored Gates' energy, boosted his social life, and became the business partner he needed.
If you’re an athlete (yes, recreational sports count!), body composition can be a critical and sometimes overlooked training metric. Tracking muscle growth lets you know if your current ...
"Love Will Keep Us Together" – Captain & Tennille (18th Grammy Awards in 1976) " This Masquerade " – George Benson ( 19th Grammy Awards in 1977) " Hotel California " – Eagles ( 20th Grammy ...