SQL Server DROP TABLE First, specify the name of the table to be removed. Second, specify the name of the database in which the table was created and the name of the schema to which the table belongs. The database name is optional. Third, use IF EXISTS clause to remove the table only if it exists. How do I drop a table in Oracle?
How to check if a table exist in Oracle?
well i'm sure there are a number of ways you could go about it. However, one way would be to declare a variable of integer type, then select into that variable a count() of all the records from the all_table view that have the name you are looking for. a result of 0 suggests no table has been created a count of 1 would suggest the table exists.
How do I check if a table exists?
- OBJECT_ID () function (all supported versions)
- Querying the sys.tables System View (all supported versions)
- Querying the INFORMATION_SCHEMA.TABLES View (all supported versions)
- DROP TABLE with IF EXISTS (SQL Server 2016 and up)
How to use drop if exists in SQL Server?
The syntax for DROP IF EXISTS
- It drops the object if it already exists in the SQL database
- We can also use it to drop the column or constraints as well
- If the specified object does not exist, it does not give any error message. It continues the execution for the next command
Does a "if exists" clause exist in Oracle?
This is mostly uses to suppress error messages in the database schema creation scripts when they are executed for the first time. 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.
How do I force a table to drop in Oracle?
SyntaxDROP [schema_name]. TABLE table_name.[ CASCADE CONSTRAINTS ][ PURGE ];
How do I drop an existing table?
SQL DROP TABLE StatementDROP TABLE table_name;Example. DROP TABLE Shippers;TRUNCATE TABLE table_name;
How do you completely delete a table in Oracle?
Use the DROP TABLE statement to move a table or object table to the recycle bin or to remove the table and all its data from the database entirely.
How do you drop an existing object in Oracle?
Use the DROP TYPE statement to drop the specification and body of an object type, a varray, or a nested table type. See Also: DROP TYPE BODY for information on dropping just the body of an object type. CREATE TYPE and ALTER TYPE for information on creating and modifying types.
What is DROP TABLE if exists?
Description. The DROP TABLE statement deletes the specified table, and any data associated with it, from the database. The IF EXISTS clause allows the statement to succeed even if the specified tables does not exist.
How do I delete a table in database?
To delete a table from the databaseIn Object Explorer, select the table you want to delete.Right-click the table and choose Delete from the shortcut menu.A message box prompts you to confirm the deletion. Click Yes. Deleting a table automatically removes any relationships to it.
How do you delete a table from a tablespace?
You must first remove the tablespace from the database default temporary tablespace group and then drop it. You cannot drop a tablespace, even with the INCLUDING CONTENTS and CASCADE CONSTRAINTS clauses, if doing so would disable a primary key or unique constraint in another tablespace.
What is purge table?
Purpose. Use the PURGE statement to remove a table or index from your recycle bin and release all of the space associated with the object, or to remove the entire recycle bin, or to remove part of all of a dropped tablespace from the recycle bin.
Does DROP TABLE need commit?
CREATE TABLE and DROP TABLE statements do not commit a transaction if the TEMPORARY keyword is used. (This does not apply to other operations on temporary tables such as ALTER TABLE and CREATE INDEX , which do cause a commit.)
How do I drop a table with constraints in SQL?
To drop a foreign key from a table, use the ALTER TABLE clause with the name of the table (in our example, student ) followed by the clause DROP CONSTRAINT with the name of the foreign key constraint. In our example, the name of this constraint is fk_student_city_id .
What is drop table command in SQL?
We use the SQL DROP Table command to drop a table from the database. It completely removes the table structure and associated indexes, statistics, permissions, triggers and constraints. You might have SQL Views and Stored procedures referencing to the SQL table.
How do I drop all objects in a schema?
The query below will return a statement that can be used to drop all the tables which are present in the current user A's schema (normal scenario). select 'drop '||object_type||' '|| object_name || ';' from user_objects where object_type in ('VIEW','PACKAGE','SEQUENCE', 'PROCEDURE', 'FUNCTION', 'INDEX');
How do you delete a table in Word without deleting content?
Click on the table you want to remove. This action also will trigger an exclusive menu for managing the table.Go to the Table Tools > Layout menu.Click Convert to Text.Select the separator type between text, then click OK. ... The table is now removed and the text still there.
How do I remove a table in word but keep the text?
Convert a table to textSelect the rows or table you want to convert to text.On the Layout tab, in the Data section, click Convert to Text.In the Convert to Text box, under Separate text with, click the separator character you want to use in place of the column boundaries. ... Click OK.
How do I remove a table in Excel but keep the data?
To remove a table but keep data and formatting, go to the Design tab Tools group, and click Convert to Range. Or, right-click anywhere within the table, and select Table > Convert to Range.
How do I remove a table from a data model in Excel?
Delete the TableSelect the entire Excel table.Click the Home tab.Click on Clear (in Editing group)Click on Clear All.
Option 1: Check if the Table Exists
We can check the DBA_TABLES data dictionary view to see if the table exists. This view describes all relational tables in the database. Its columns are the same as those in ALL_TABLES.
Option 2: Test for the Error
Another way to do it is to simply go ahead and run the DROP TABLE statement, and then catch any ORA-00942 error that occurs. Specifically, we catch any SQLCODE -942 error that occurs.
How to move a table to the recycle bin?
To move a table to the recycle bin or remove it entirely from the database, you use the DROP TABLE statement: First, indicate the table and its schema that you want to drop after the DROP TABLE clause. If you don’t specify the schema name explicitly, the statement assumes that you are removing the table from your own schema.
What does the purge clause do in Oracle?
By using the PURGE clause, Oracle will not place the table and its dependent objects into the recycle bin. Notice that the PURGE clause does not allow you to roll back or recover the table that you dropped. Therefore, it is useful if you don’t want the sensitive data to appear in the recycle bin.
Does fk_brand drop from the cars table?
This statement dropped not only the brands table but also the foreign key constraint fk_brand from the cars table.
Does T-SQL need to be the same in Oracle?
That T-SQL is a bunch of cr*p, doesn't need to result in the same cr*p in Oracle.
Can you query all_tables?
You can query all_tables for the table you want.
What is the if clause in MySQL?
In MySQL you can use IF EXISTS clause in the DROP TABLE statement. This is mostly uses to suppress error messages in the database schema creation scripts when they are executed for the first time.
Can you query catalogs views?
You can query catalogs views (ALL_TABLES or USER_TABLE i.e) to check if the required table exists:
Does Oracle have if exists clause?
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.
