What is the difference between macros and procedure?
Macro definition contains a set of instruction to support modular programming. Procedure contains a set of instructions which can be called repetitively which can perform a specific task. 02. It is used for small set of instructions mostly less than ten instructions.
What is the syntax of macros?
A macro is composed of two parts: a macro-name and a definition. A macro name is an alphanumeric character string starting with an alphabetic character and terminating with a colon. A macro name must not exceed 20 characters in length and may only contain alphanumeric characters (a-z, 0-9).
What is macro syntax in system programming?
A macro instruction is a request to the assembler program to process a predefined sequence of instructions called a macro definition. From this definition, the assembler generates machine and assembler instructions, which it then processes as if they were part of the original input in the source module.
What is the difference between macro and stored procedure in Teradata?
The macro contains only SQL and maybe dot commands that are only for use in BTEQ. Normally a SELECT results in rows being returned to the user. A stored procedure does not return rows to the user like a macro. Instead, the selected column or columns must be used within the procedure.
What is macro give an example what are the differences between macro and procedure?
Difference between Macro and Procedure
| S.No. | MACRO |
|---|---|
| 1 | A macro is a set of rules or programmable patterns, which decrypts a specific sequence of input into a preset sequence of output. |
| 2 | A macro is used for a small set of instructions. |
| 3 | We require more memory in the case of macro. |
How Macros are stored and executed?
Macro is a set of SQL statements which are stored and executed by calling the Macro name. The definition of Macros is stored in Data Dictionary. Users only need EXEC privilege to execute the Macro. Users don’t need separate privileges on the database objects used inside the Macro.
What Is syntax of macro in microprocessor?
The Syntax for macro definition − %macro macro_name number_of_params %endmacro. Where, number_of_params specifies the number parameters, macro_name specifies the name of the macro. The macro is invoked by using the macro name along with the necessary parameters.
What is the difference between macro and subroutine?
Subroutines (FORM) can be called from both the program the are defined in and other programs. A MACRO is more or less an abbreviation for some lines of code that are used more than once or twice. A FORM is a local subroutine (which can be called external).
What is stored procedure in Teradata?
Definition. A stored procedure, a database object executed on the Teradata Database, is a combination of SQL statements and control and condition handling statements that provide an interface to the Teradata Database. The term stored procedure refers to a stored procedure you write with SQL statements.
What is the difference between macro and function in C?
A macro is a name given to a block of C statements as a pre-processor directive….Conclusion:
| Macro | Function |
|---|---|
| Macros are Preprocessed | Functions are Compiled |
| No Type Checking is done in Macro | Type Checking is Done in Function |
| Using Macro increases the code length | Using Function keeps the code length unaffected |
Can you write macro in SQL?
You can create SQL macros (SQM) to factor out common SQL expressions and statements into reusable, parameterized constructs that can be used in other SQL statements.
How macros are stored and executed?
What is Teradata macro?
Macro is a set of SQL statements that are stored and executed by calling the Macro name. The definition of Macros is stored in the Data Dictionary. Users only need EXEC privilege to execute the Macro.
Where are stored procedures stored in Teradata?
A stored procedure contains a set of SQL statements and procedural statements. They may contain only procedural statements. The definition of stored procedure is stored in database and the parameters are stored in data dictionary tables.
Why macro is faster than function?
Macro execution is faster than function execution because in function, much of time is used to take control from function call to called function and much of time is spent in this process. Whereas in macro expression are directly replaced in the source code.
Are Macros and SQL the same?
SQL Macros allow developers to encapsulate complex processing within a new structure called a “macro” which can then be used within SQL statement. Essentially there two types of SQL Macros: SCALAR and TABLE. What’s the difference: SCALAR expressions can be used in SELECT list, WHERE/HAVING, GROUP BY/ORDER BY clauses.
What is the difference between macro and procedure?
give an example. Answer: ——-. A macro is a group of repetitive instructions in a program which are codified only once and can be used as many times. as necessary. The main difference between a macro and a procedure is that in the macro the passage of parameters is possible and in the.
What is the difference between macro parameter and procedure parameter?
In a macro parameter is passed as part of statement that calls macro. In a procedure parameters are passed in registers and memory locations of stack. 09. Overhead time does not take place as there is no calling and returning.
What is the syntax of macro in Python?
The syntax of Macro is as follows. The macro_name helps to identify the macro and the number_of_params refers to the number parameters. Additionally, it is possible to invoke the macro using the macro name with the required parameters.
What is the difference between assembler directive macro and Proc?
Assembler directive MACRO is used to define macro and assembler directive ENDM is used to indicate the body is over. Assembler directive PROC is used to define procedure and assembler directive ENDP is used to indicate the body is over. 06. Execution time of macro is less than it executes faster than procedure.