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What type of PL SQL variables are also called pointers?
reference type
A reference type holds values, called pointers, that designate other program items. A LOB type holds values, called lob locators, that specify the location of large objects, such as text blocks or graphic images, that are stored separately from other database data. Figure 3-1 shows the predefined PL/SQL datatypes.
Does PL SQL supports programming language?
Users are able to use SQL to manipulate objects and data, but SQL doesn’t include loops or IF/THEN statements. PL/SQL includes all the features of programming languages and integrates easily with SQL.
Which of the following data types support PL SQL?
PL/SQL provides many predefined datatypes. For instance, you can choose from integer, floating point, character, BOOLEAN , date, collection, reference, and large object (LOB) types. PL/SQL also lets you define your own subtypes.
Which of the following are the features of PL SQL?
Features of PL/SQL
- PL/SQL is tightly integrated with SQL.
- It offers extensive error checking.
- It offers numerous data types.
- It offers a variety of programming structures.
- It supports structured programming through functions and procedures.
- It supports object-oriented programming.
What are types of variables in PL SQL?
A wide range of data types are supported and can be used to declare variables in a PL/SQL block….Data types (PL/SQL)
| PL/SQL data type | DB2® SQL data type | Description |
|---|---|---|
| INTEGER | INTEGER | Signed four-byte integer numeric data |
| LONG | CLOB (32760) | Character large object data |
What is type in PL SQL?
The %TYPE attribute, used in PL/SQL variable and parameter declarations, is supported by the data server. Use of this attribute ensures that type compatibility between table columns and PL/SQL variables is maintained. If the data type of the column or variable changes, there is no need to modify the declaration code.
Where is PL SQL used?
Function. The purpose of a PL/SQL function is generally used to compute and return a single value. This returned value may be a single scalar value (such as a number, date or character string) or a single collection (such as a nested table or array).
Which identifier is valid in PL SQL?
You can use uppercase, lowercase, or mixed case to write identifiers. PL/SQL is not case-sensitive except within string and character literals. Every character, including dollar signs, underscores, and number signs, is significant.
Where do we declare PL SQL variable?
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.
Where is the cursor defined in PL / SQL?
An explicit cursor should be defined in the declaration section of the PL/SQL Block. It is created on a SELECT Statement which returns more than one row. Declaring the cursor defines the cursor with a name and the associated SELECT statement. For example −
How does PL / SQL resolve identifier names-Oracle?
During compilation, the PL/SQL compiler determines which objects are associated with each name in a PL/SQL subprogram. A name might refer to a local variable, a table, a package, a subprogram, a schema, and so on. When a subprogram is recompiled, that association might change if objects were created or deleted.
Which is the most recent implicit cursor in SQL?
In PL/SQL, you can refer to the most recent implicit cursor as the SQL cursor, which always has attributes such as %FOUND, %ISOPEN, %NOTFOUND, and %ROWCOUNT.
What are the two types of cursors in SQL?
There are two types of cursors − Implicit cursors are automatically created by Oracle whenever an SQL statement is executed, when there is no explicit cursor for the statement. Programmers cannot control the implicit cursors and the information in it.