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A SELECT statement retrieves zero or more rows from one or more database tables or database views. In most applications, SELECT is the most commonly used data manipulation language (DML) command. As SQL is a declarative programming language, SELECT queries specify a result set, but do not specify how to calculate it.
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.
In a MultiValue database system: a database or schema is called an "account" a table or collection is called a "file" a column or field is called a field or an "attribute", which is composed of "multi-value attributes" and "sub-value attributes" to store multiple values in the same attribute.
Box hockey (or schlockey) is an active hand game played between two people with sticks, a puck and a compartmented box (typically 5–8 feet or 1.5–2.4 meters long), and typically played outdoors. The object of the game is to move a hockey puck through the center dividers of the box, out through a hole placed at each end of the box, also ...
Each table cannot have more than one primary key. On some RDBMS a primary key generates a clustered index by default. Unique constraint. A unique constraint can be defined on columns that allow nulls, in which case rows that include nulls may not actually be unique across the set of columns defined by the constraint.
A hierarchical query is a type of SQL query that handles hierarchical model data. They are special cases of more general recursive fixpoint queries, which compute transitive closures. In standard SQL:1999 hierarchical queries are implemented by way of recursive common table expressions (CTEs).
The burgeoning winger has 22 power-play points to boot, but his performance there, while beneficial, is also a reason why he's a minus-26 since more than half his points have come on the man ...
The use of plastic brought an expansion of table hockey. The Swedish company Stiga started to make hockey tables in the late 1950s. [8] Thanks to the enthusiasm of Swedish players, table hockey expanded to the rest of the world. Big worldwide development arrived in the late 1990s. That led to an idea founding an international federation.