How do you drop a table only if it exists in Oracle?

Oracle does not provide IF EXISTS clause in the DROP TABLE statement, but you can use a PL/ SQL block to implement this functionality and prevent from errors then the table does not exist.

What are the DBA tables in Oracle?

DBA_TABLES describes all relational tables in the database. Its columns are the same as those in ALL_TABLES .

How do I find Oracle Sqlcode?

The function SQLCODE returns the number code of the most recent exception. For internal exceptions, SQLCODE returns the number of the associated Oracle error. The number that SQLCODE returns is negative unless the Oracle error is no data found, in which case SQLCODE returns +100 .

How do I check if a table exists in PL SQL?

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.

How do you check if a table is empty in Oracle?

IF((SELECT COUNT(*) FROM IPA_PRCADJ_HDR WHERE TRM_CODE = 41) = 0) THEN select ‘111111’ from dual; ELSE SELECT ‘0000000’ FROM DUAL; END IF; showing error..

How do I raise an exception in Oracle?

Raising a user-defined exception example

First, declare a user-defined exception e_credit_too_high and associates it with the error number -20001 .
Second, select maximum credit from the customers table using the MAX() function and assign this value to the l_max_credit variable.

What is Pragma Exception_init in Oracle?

The pragma EXCEPTION_INIT associates an exception name with an Oracle error number. You can intercept any ORA- error and write a specific handler for it instead of using the OTHERS handler. You can use EXCEPTION_INIT in the declarative part of any PL/SQL block, subprogram, or package. …

What is the use of 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 I check if a table is empty in PL SQL?

How to check whether table exists in SQL?

To check if a table exists in SQL Server, you can use the INFORMATION_SCHEMA.TABLES table. Running the following code, produces the results below: You can use this table with an IF THEN clause do determine how your query responds whether or not a table exists. One of the more common uses I find for this when I need to create a table in a script.

How do I check if an index exists in SQL?

How to check if an Index exists in Sql Server Approach 1: Check the existence of Index by using catalog views Approach 2: Check the existence of Index by using sys.indexes catalog view and OBJECT_ID function

How do I create a SQL query?

To Create A SQL Query In the Workbench, click Source > Configure. The Configure Source dialog box appears. Select the Custom Query option. Do one of the following: Enter a SQL statement in the SQL Query pane. Click Open Query, navigate to a saved query, and modify the opened query.

What is a drop table in SQL?

The SQL DROP TABLE statement is used to remove a table definition and all the data, indexes, triggers, constraints and permission specifications for that table.

How do you drop a table only if it exists in Oracle? Oracle does not provide IF EXISTS clause in the DROP TABLE statement, but you can use a PL/ SQL block to implement this functionality and prevent from errors then the table does not exist. What are the DBA tables in Oracle? DBA_TABLES describes…