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Operator PrecedenceThe operations within an expression are completed in a particular order depending on their precedence (priority). The table shows the default order of the operations from first to last (from top to bottom).
Table: Order of OperationsThe Operators with higher precedence are applied first. In the illustration below, both the expressions yield 8 as the division has a higher precedence than addition. The Operators with similar precedence are applied in no particular order.
5 + 12 / 412 / 4 + 5You can use the parentheses to control the order of the evaluation. For illustration, the expression below yields 7, not 11, as the parentheses override the default operator precedence:(8 + 6) / 2In the later example, the subtraction is completed before the division as the most deeply nested sub expression is always checked first:100 + (20 / 5 + (7 - 3))
BETWEEN Operator The operator BETWEEN, tests whether the value lies in a specified series. That means "greater than or equivalent to low value and less than or equivalent to hig
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Using a join on 3 tables, select 5 columns and 10 rows from the 3 tables without the use of a Cartesian product Query: SELECT E.LAST_NAME, E.FIRST_NAME, S.BUILDING, S.BRAN
Transaction Control The Oracle is transaction oriented; that is, Oracle uses the transactions to make sure the data integrity. The transaction is a sequence of SQL data manip
Using DEFAULT You can use the keyword DEFAULT rather than that of the assignment operator to initialize the variables. For e.g. the declaration blood_type CHAR := ’O’; it can b
Keyword & Parameter Description: boolean_expression: This is an expression which yields the Boolean value that is TRUE, FALSE, & NULL. character_expression: This
Initializing Records The illustration below shows that you can initialize a record in its type definition. Whenever you declare a record of the type TimeRec, its 3 fields supp
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Cursors The Oracle uses work areas to execute the SQL statements and to store process information. A PL/SQL construct known as the cursor. Let's you assume name a work area and
Example of WHEN or THEN Constraints A concrete example showing how SQL supports WHEN/THEN constraints CREATE TABLE SAL_HISTORY (EmpNo CHAR (6), Salary INTEGER NOT NULL,
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