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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))
LOB Types The large object (LOB) datatypes like BFILE, BLOB, CLOB, and NCLOB store the blocks of unstructured data (like graphic images, text, video clips, and sound waveforms)
Inner Join We have learned how to retrieve data from one table by using SELECT statement. But, as we have learned, normalized relational databases mean the data is spread betw
Effects of NULL in Table Literal When a VALUES expression appears as the source value for an SQL INSERT statement, the key word NULL can appear as a field value, such that for
Using FORALL and BULK COLLECT Together You can unite the BULK COLLECT clause with the FORALL statement, in that case, the SQL engine bulk-binds column values incrementally. In
Using Subqueries A subquery is a query (typically enclosed by parentheses) that appears within another SQL data manipulation statement. If evaluated, the subquery gives a va
Introduction Oracle 9i - it was made public in the year 2001 with over 400 features, and graphics, it has merged the traditional business with modern internet application
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
Left and Right Joins LEFT OUTER JOIN can be used when you want to retrieve the data from the main table (table1) even if there is no match in other tables (table_2, table_3...
Parameter Modes To define the behavior of formal parameters you use the parameter modes. The 3 parameter modes, IN, OUT, & IN OUT, can be used with any subprogram. Though, a
Implicit Cursor is declared and used by the oracle environment internally. while the explicit cursor is declared and used by the external user. more over implicitly cursors are no
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