COMPUTER SCIENCE AND ENGINEERING
SQL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It is used to select a database
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It is used to select data from a database
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It is used to select a website
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It is not a SQL statement
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Detailed explanation-1: -The SELECT statement is used to select data from a database. The data returned is stored in a result table, called the result-set.
Detailed explanation-2: -The SQL SELECT statement returns a result set of records, from one or more tables. 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.
Detailed explanation-3: -SELECT statements The syntax is: SELECT column1, column2 FROM table1, table2 WHERE column2=’value’; In the above SQL statement: The SELECT clause specifies one or more columns to be retrieved; to specify multiple columns, use a comma and a space between column names.
Detailed explanation-4: -SELECT statement options. SQL SELECT has different clauses to manage the data output. They are: FROM, AS, GROUP BY, HAVING, INTO, ORDER BY, * (asterisk).
Detailed explanation-5: -The SELECT command creates a temporary select-list of file items to be processed by the next TCL or INFO/ACCESS statement, or by other processors such as the Editor, mvBASIC, or PROC. Creating a select-list is a useful way to define and operate on a subset of items in a database.