Contents
Which is the logical operator in PL SQL?
Logical Operators in PL/SQL
| Operator | Description |
|---|---|
| or | Called the logical OR Operator. If any of the two operands is true then condition becomes true. |
| not | Called the logical NOT Operator. Used to reverse the logical state of its operand. If a condition is true then Logical NOT operator will make it false. |
What does || mean in PL SQL?
The || Operator in PLSQL is used to concatenate 2 or more strings together. The result of concatenating two character strings is another character string.
What does (+) mean in Oracle SQL?
The plus sign is Oracle syntax for an outer join. There isn’t a minus operator for joins. An outer join means return all rows from one table. Also return the rows from the outer joined where there’s a match on the join key. If there’s no matching row, return null.
Is as in PL SQL?
Answer: The PL/SQL language evolved such the the “IS” and “AS” operators are equivalent. Functionally the “IS” and “AS” syntax performs identical functions and can be used interchangeably. However, in SQL there is a subtle difference between “AS” and “IS”: SQL> create or replace view emp_view as select * from scott.
Where do we declare PL SQL?
You must declare the PL/SQL variable in the declaration section or in a package as a global variable. After the declaration, PL/SQL allocates memory for the variable’s value and the storage location is identified by the variable name.
Are there any logical operators in PL / SQL?
Help Wanted! The PL/SQL language is very powerful and any IF condition evaluation can consist of multiple comparisons, joined together by logical operators. In the next example, the IF condition on line 6 contains three evaluations, joined by the AND/OR logical operators .
When to use the or operator in Oracle?
We often use the OR operator in the WHERE clause of the SELECT, DELETE, and UPDATE statements to form a condition for filtering data. If you use multiple logical operators in a statement, Oracle evaluates the OR operators after the NOT and AND operators.
Which is an example of a PL / SQL literal?
For example, 123 is an integer literal and ‘abc’ is a character literal, but 1+2 is not a literal. PL/SQL literals include all SQL literals (described in Oracle Database SQL Language Reference) and BOOLEAN literals (which SQL does not have). A BOOLEAN literal is the predefined logical value TRUE, FALSE, or NULL.
When to combine Oracle and condition in PLSQL?
The Oracle AND condition and OR condition can be combined in a SELECT, INSERT, UPDATE, or DELETE statement. When combining these conditions, it is important to use parentheses so that the database knows what order to evaluate each condition.