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Parameter and Keyword Description:
dynamic_string:
This is a string variable, literal, or expression which represents a SQL statement or the PL/SQL block.
define_variable_name:
This identifies a variable which stores a SELECTED column value.
record_name:
This identifies a user-defined or %ROWTYPE record which stores a SELECTED row.
bind_argument_name:
These identify an expression whose value is passed to the PL/SQL block or dynamic SQL statement.
INTO ...:
This clause, useful only for specifies the variables record, or single-row queries into which the column values are fetched.
USING ...:
This clause specifies the list of bind arguments. If you do not specify the parameter mode, it default to IN. At run time, a few bind arguments in the USING clause substitute the corresponding placeholders in the PL/SQL block or SQL statement.
CHECK Constraints in SQL A CHECK constraint is a table constraint defined using the key word CHECK, as already illustrated in several examples in this chapter. In particular,
Restriction in SQL Syntax: SELECT DISTINCT StudentId FROM IS_CALLED WHERE Name = 'Boris' The WHERE clause operates on the result of the FROM clause in analogo
Attributes: Just similar to variable, an attribute is declared with a name and datatype. The name should be exclusive within the object type. The datatype can be any Oracle ty
Constants and Variables: You can declare the constants and variables in the declarative section of any PL/SQL subprogram, block, or package. The Declarations allot the stor
Updating Variables For assignment, SQL uses the key word SET, as in SET X = X + 1 (read as "set X equal to X+1") rather than X: = X + 1 as found in many computer languages.
UNNEST operator in SQL The inverse operator of GROUP is UNGROUP. SQL has an operator, UNNEST, that can be used for similar purposes, but its method of invocation is somewhat p
EXECUTE Privilege To call an invoker-rights routine straightforwardly, the users should have the EXECUTE privilege on that routine. By yielding the privilege, you permit a user
Order of Evaluation When you do not use the parentheses to specify the order of evaluation, the operator precedence determine the order. Now compare the expressions below: NOT
Using Operator VALUE: As you may expect, the operator VALUE returns the value of an object. The VALUE takes its argument a correlation variable. For illustration, to return a
ORIGIN OF EARTH - BIG-BAN G HYPOTHESIS - Origin of life is linked to origin of earth. Cosmos, the Universe originated 10-20 billion years ago by Big Bang (thermonu
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