- How do you create a table only if it does not exist in Oracle?
- How does PL SQL work?
- What is execute immediate?
- Is create table DDL or DML?
- How do you create a temp table?
- Can we create table in PL SQL block?
- How do you check if a table exists in Oracle?
- Can we use DML statement in procedure?
- How do you drop a table if it exists in Oracle?
- What is execute immediate in Oracle?
- How do you create an empty table in SQL?
- Can we use DDL in procedure?
- Can we use DDL statements in stored procedure SQL Server?
- How do you check if a table exists in SQL?
- Can you create a temp table in a stored procedure?
- Can we use views in stored procedure?
- How do I create a student table in SQL?
- Should I drop temp table in stored procedure?
- Can we use create table in procedure?
- How can we create a table?
- Can you have a foreign key on a temp table?
How do you create a table only if it does not exist in Oracle?
declare begin execute immediate ‘create table “TABELLA” (“ID” number not null)’; exception when others then if SQLCODE = -955 then null; else raise; end if; end; On Oracle DB documentation you can find all the error codes you can catch..
How does PL SQL work?
ORACLE PL/SQL is an extension of SQL language that combines the data manipulation power of SQL with the processing power of procedural language to create super powerful SQL queries. … PL/SQL is designed for seamless processing of SQL statements enhancing the security, portability, and robustness of the database.
What is execute immediate?
The EXECUTE IMMEDIATE statement prepares (parses) and immediately executes a dynamic SQL statement or an anonymous PL/SQL block. The main argument to EXECUTE IMMEDIATE is the string containing the SQL statement to execute. You can build up the string using concatenation, or use a predefined string.
Is create table DDL or DML?
DDL is Data Definition Language which is used to define data structures. For example: create table, alter table are instructions in SQL. DML: DML is Data Manipulation Language which is used to manipulate data itself.
How do you create a temp table?
The Syntax to create a Temporary Table is given below:To Create Temporary Table: CREATE TABLE #EmpDetails (id INT, name VARCHAR(25))To Insert Values Into Temporary Table: INSERT INTO #EmpDetails VALUES (01, ‘Lalit’), (02, ‘Atharva’)To Select Values from Temporary Table: SELECT * FROM #EmpDetails.Result: id. name. Lalit.
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.
How do you check if a table exists in Oracle?
You can also check the data dictionary to see if a table exists: SQL> select table_name from user_tables where table_name=’MYTABLE’; Another way to test if a table exists is to try to drop the table and catch the exception if it does not exist.
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.
How do you drop a table if it exists in Oracle?
There is no ‘DROP TABLE IF EXISTS’ in oracle, you would have to do the select statement. Another method is to define an exception and then only catch that exception letting all others propagate. One way is to use DBMS_ASSERT.
What is execute immediate in Oracle?
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.
How do you create an empty table in SQL?
In this syntax:First, specify the name of the database in which the table is created. … Second, specify the schema to which the new table belongs.Third, specify the name of the new table.Fourth, each table should have a primary key which consists of one or more columns.More items…
Can we use DDL in procedure?
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. …
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.
How do you check if a table exists in SQL?
SQL: Check if table existsYou can use this table with an IF THEN clause do determine how your query responds whether or not a table exists. … IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = N’employee_ids’) BEGIN PRINT ‘Yes’ END ELSE BEGIN PRINT ‘No’ End.More items…•
Can you create a temp table in a stored procedure?
Stored procedures can reference temporary tables that are created during the current session. Within a stored procedure, you cannot create a temporary table, drop it, and then create a new temporary table with the same name.
Can we use views in stored procedure?
A view is just a macro that expands into an outer query. If your view contains several joins, then when you join if to other views you suddenly have a 20 or 30 way JOIN when you actually see 3 JOINs in the SQL of the stored procedure. … Using a stored procedure already means no base table access (ownership chaining).
How do I create a student table in SQL?
The basic syntax for creating a table with the other table is:CREATE TABLE table_name AS.SELECT column1, column2,…FROM old_table_name WHERE ….. ;The following SQL creates a copy of the employee table.CREATE TABLE EmployeeCopy AS.SELECT EmployeeID, FirstName, Email.FROM Employee;
Should I drop temp table in stored procedure?
No need to drop temp tables explicitly. SQL server will handle to drop temp tables stored in temp db in case of shorage of space to process query.
Can we use create table in procedure?
To elaborate a bit on the other answers, yes, you must use dynamic SQL to create a table or perform any other kind of DDL (data definition language) operation in PL/SQL.
How can we create a table?
AnswerOpen a blank Word document.In the top ribbon, press Insert.Click on the Table button.Either use the diagram to select the number of columns and rows you need, or click Insert Table and a dialog box will appear where you can specify the number of columns and rows.The blank table will now appear on the page.More items…•
Can you have a foreign key on a temp table?
One of the restrictions on a foreign key relationship is that you cannot delete a row from a key table that is depended upon by your temp table. … Could be because you can’t have cross-database foreign key constraints and temp tables technically are created in the TempDB database.