Can DDL be used in PL SQL?

Asked By: Coro Tabiar | Last Updated: 15th January, 2020
Category: technology and computing databases
4.5/5 (206 Views . 9 Votes)
PL/SQL can only use SELECT, DML(INSERT, UPDATE, DELETE) and TC(COMMIT, ROLLBACK, SAVEPOINT) statements, DDL (CREATE, ALTER, DROP) and DCL(GRANT, REVOKE) cannot be used directly. Any DDL/DCL however, can be executed from PL/SQL when embedded in an EXECUTE IMMEDIATE statement.

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Consequently, can we use DDL in procedure?

DDL statements are not allowed in Procedures (PLSQL BLOCK) PL/SQL objects are precompiled. On the other hand, DDL (Data Definition Language) statements like CREATE, DROP, ALTER commands and DCL (Data Control Language) statements like GRANT, REVOKE can change the dependencies during the execution of the program.

Additionally, what is a DDL command? A data definition or data description language (DDL) is a syntax similar to a computer programming language for defining data structures, especially database schemas. DDL statements create and modify database objects such as tables, indexes, and users. Common DDL statements are CREATE , ALTER , and DROP .

Similarly, you may ask, can we use DDL in function in Oracle?

No DDL allowed: A function called from inside a SQL statement is restricted against DDL because DDL issues an implicit commit. You cannot issue any DDL statements from within a PL/SQL function. Restrictions against constraints: You cannot use a function in the check constraint of a create table DDL statement.

Can we create table in PL SQL block?

DDL commands are not allowed as PL/SQL constructs in PL/SQL blocks. Using DBMS_SQL or EXECUTE IMMEDIATE, we can execute create table, drop, alter, analyze, truncate and other DDL's too. PL/SQL PROCEDURE successfully completed.

25 Related Question Answers Found

What is execute immediate in Oracle?

EXECUTE IMMEDIATE Statement. The EXECUTE IMMEDIATE statement executes a dynamic SQL statement or anonymous PL/SQL block. You can use it to issue SQL statements that cannot be represented directly in PL/SQL, or to build up statements where you do not know all the table names, WHERE clauses, and so on in advance.

Can we use DDL statements in stored procedure SQL Server?

You can use only DDL COMMENT statements in a stored procedure. You cannot specify DML COMMENT statements, which are restricted to embedded SQL applications, to fetch the comments for database objects, columns of a table, and parameters. All variations of CREATE TABLE statement are valid.

How do I run a DDL script in Oracle?

How to execute CREATE TABLE DDL using Execute Immediate in Oracle Database?
  1. Step 1: Prepare your DDL beforehand.
  2. Step 2: Run your DDL through PL/SQL program using Execute Immediate.
  3. First: Always enclose your SQL statement into a pair of Single Quotes.
  4. Second: Take care of Semi-colon.

Can we use DML statement in procedure?

You can directly enter SQL data manipulation language (DML) statements inside PL/SQL blocks, and you can use procedures, supplied by Oracle, to perform data definition language (DDL) statements.

Can we create table inside stored procedure?


In a stored procedure you can create a table or view. The table can be a temporary, in-memory table (see CREATE TABLE ). However, you cannot then refer to that table or view within that same stored procedure. The CREATE PROCEDURE / ALTER PROCEDURE statement compiles all SQL SELECT and DML statements.

Can we call a function containing DML statements in a select query?

We can not place any DML statement inside a function simply and also a function with a DML statement cannot be used inside a SELECT query.

Can Oracle functions have DML statements?

You can perform DML operations inside an Oracle PL/SQL function and, although this is generally not a good practice, call it from SQL. You should be aware that this kind of function called from SQL can dramatically degrade your queries performances. I recommend you use it only for audit purposes.

Can we commit inside a function in Oracle?

Yes, you can do that if you make the function an autonomous transaction. That way it will not be part of the current transaction anymore. . DDL statements implicitly commit the current transaction, so a user-defined function cannot execute any DDL statements.

What is Pragma autonomous transaction in Oracle?

The AUTONOMOUS_TRANSACTION pragma changes the way a subprogram works within a transaction. A subprogram marked with this pragma can do SQL operations and commit or roll back those operations, without committing or rolling back the data in the main transaction. Pragmas are processed at compile time, not at run time.

Can we write insert statement in function in Oracle?


Function with insert statement can be called from a DML statement. : Function Call « Stored Procedure Function « Oracle PL / SQL. Function with insert statement can be called from a DML statement.

Can we use update statement in function in Oracle?

The stored function may not modify database tables. It cannot execute an INSERT, DELETE, or UPDATE statement. A stored function that is called remotely or through a parallelized action may not read or write the values of package variables. The Oracle Server does not support side effects that cross user sessions.

What are all DDL commands?

Data Definition Language (DDL) Statements
Create, alter, and drop schema objects. Grant and revoke privileges and roles. Analyze information on a table, index, or cluster. Establish auditing options.

What is DDL of a table?

DDL. Stands for "Data Definition Language." A DDL is a language used to define data structures and modify data. For example, DDL commands can be used to add, remove, or modify tables within in a database. Since DDL is a subset of SQL, it does not include all the possible SQL commands.

What is data type in SQL?

SQL Data Type is an attribute that specifies the type of data of any object. Each column, variable and expression has a related data type in SQL. You can use these data types while creating your tables. You can choose a data type for a table column based on your requirement.

What is foreign key in database?


A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables. The concept of referential integrity is derived from foreign key theory. Foreign keys and their implementation are more complex than primary keys.

Is truncate DDL or DML?

truncate is not "transactional" in the sense that it commits and can't be rolled back, and can modify object storage attributes. So it's not ordinary DML - Oracle classifies it as DDL. delete is an ordinary DML statement.

What does DML mean in SQL?

Data Manipulation Language