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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))
Keys in SQL SQL support for keys in the following respects: SQL does not require at least one key for every base table. If no key is explicitly declared, then KEY {ALL B
Short-Circuit Evaluation When computing a logical expression, the PL/SQL uses short-circuit evaluation. That is, the PL/SQL stops computing the expression as soon as the result
Use Bulk Binds If SQL statements execute inside a loop using the collection elements as bind variables, context switching between the PL/SQL & SQL engines can slow down the ex
Keyword & Parameter Description: PRAGMA: These keywords signify that the statement is a pragma (i.e. compiler directive). The Pragmas are processed at the compile time, n
ROWNUM The ROWNUM returns a number representing the order in which a row was selected from the table. The first row selected has a ROWNUM of 1; the second row has a ROWNUM of
Semidifference via NOT IN and a subquery SELECT StudentId FROM IS_CALLED WHERE Name = 'Devinder' AND StudentId NOT IN (SELECT StudentId FROM IS_ENROLLED_ON WHER
Authorisations - Privileges As relational theory is silent on the issue of authorisation, it offers nothing with which SQL's vast edifice in support of what it calls privilege
Procedures The procedure is a subprogram which performs a specific action. You write procedures using the syntax as shown below: PROCEDURE name [(parameter[, parameter, .
Varrays versus Nested Tables The Nested tables are differing from varrays in the following ways: 1) Varrays have a maximum size, while nested tables do not. 2) Varrays are
Parameter and Keyword Description: record_type_name: This identifies the user-defined type specifier that is used in the subsequent declarations of the records. NOT N
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