SQL code is written in the form of a query statement and then executed against a database. All SQL queries perform some type of data operation such as selecting data, inserting/updating data, or creating data objects such as SQL databases and SQL tables. Each query statement begins with a clause such as SELECT, UPDATE, CREATE or DELETE.
The most typical procedure within SQL is the query, that is carried out using the declarative SELECT statement. SELECT retrieves data from a number of tables, or expressions. Standard SELECT statements have no persistent effects on the database. Some non-standard implementations of SELECT can have persistent effects, such as the SELECT INTO Syntax that exists in some databases.
Queries allow the person to explain preferred data, leaving the database management system (DBMS) responsible for planning, optimizing and performing the physical operations necessary to produce that result as it chooses.
A query consists a list of columns to be included in the final result immediately following the SELECT keyword. An asterisk ("*") can also be used to specify that the query should return all columns of the queried tables. SELECT is the most complex statement in SQL, with optional keywords as well as clauses including:
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