How Do I Drop Multiple Tables?

How do I delete multiple tables in a single query?

You cannot DELETE from multiple tables with a single expression in SQL 2005 – or any other standard SQL for that matter.

Access is the exception here.

The best method to get this effect is to specify FOREIGN KEYS between the table with an ON DELETE trigger ..

How do I drop multiple tables in SQL Developer?

You can generate a list of DROP TABLE commands with the query below: SELECT ‘DROP TABLE ‘ || table_name || ‘;’ FROM user_tables; After that you remove your six tables you want to keep and execute the other commands.

Are indexes dropped when a table is dropped?

Dropping a table removes the table definition from the data dictionary. All rows of the table are no longer accessible. All indexes and triggers associated with a table are dropped. … All synonyms for a dropped table remain, but return an error when used.

How do I drop all tables?

You can do: select concat(‘drop table if exists ‘, table_name, ‘ cascade;’) from information_schema. tables; Then run the generated queries.

Why drop table if exists?

The DROP TABLE SQL statement enables you to delete a table from the database. If the table did not exist then attempting to DROP it would cause an error to occur. The DROP TABLE IF EXISTS SQL statement enables a check to see that the table exists prior to attempting the dropping (deletion) of the table.

How do I drop multiple tables in hive?

But there are multipe ways to do it, for example :With a shell script : hive -e “show tables ‘temp_*'” | xargs -I ‘{}’ hive -e ‘drop table {}’Or by putting your tables in a specific database and dropping the whole database. Create table temp.table_name; Drop database temp cascade;

How do I drop all tables in SQL Plus?

SELECT ‘DROP TABLE “‘ || TABLE_NAME || ‘” CASCADE CONSTRAINTS;’ FROM user_tables;user_tables is a system table which contains all the tables of the user.the SELECT clause will generate a DROP statement for every table.

How do I drop multiple tables at once?

You can drop one or more tables by using the DROP TABLE command, which can be executed from the Analyze page or any connected SQL client….Use CaseRun the following SQL query: SELECT ‘DROP TABLE “‘ + schemaname + ‘”. … Copy the results, not including the header.More items…•

How do I delete a row from multiple tables in SQL?

The syntax also supports deleting rows from multiple tables at once. To delete rows from both tables where there are matching id values, name them both after the DELETE keyword: DELETE t1, t2 FROM t1 INNER JOIN t2 ON =; What if you want to delete nonmatching rows?

Does drop table delete table structure?

The DROP TABLE is another DDL (Data Definition Language) operation. But it is not used for simply removing data from a table; it deletes the table structure from the database, along with any data stored in the table. This removes all data in the table product and the structure of the table. …

Can we use joins in delete query?

It is totally possible to use JOIN and multiple tables in the DELETE statement. Let us use the same table structure which we had used previously. Let us see the following example. We have two tables Table 1 and Table 2.

Can we drop multiple tables at a time in SQL?

Example 2: Drop multiple tables together using the SQL DROP Table statement. We can drop multiple tables together using a single DROP Table statement as well.

How do I delete multiple tables in SQL Server Management Studio?

In object explorer, navigate to the database you’re interested in. Expand it out and click on the Tables folder. Hit F7 to bring up the Object Explorer Details. Select the tables you want to delete and press the delete key.

How delete a row in SQL?

SQL DELETEFirst, you specify the table name where you want to remove data in the DELETE FROM clause.Second, you put a condition in the WHERE clause to specify which rows to remove. If you omit the WHERE clause, the statement will remove all rows in the table.

How do I drop all tables from database with one SQL query?

Query:DECLARE @sql NVARCHAR(max)=”SELECT @sql += ‘ Drop table ‘ + QUOTENAME(TABLE_SCHEMA) + ‘. … FROM INFORMATION_SCHEMA.TABLES.WHERE TABLE_TYPE = ‘BASE TABLE’Exec Sp_executesql @sql.Sys.Tables Version.DECLARE @sql NVARCHAR(max)=”SELECT @sql += ‘ Drop table ‘ + QUOTENAME(s.NAME) + ‘.’ … FROM sys.tables t.JOIN sys.schemas s.More items…•

Which SQL statement can delete tables?

The DROP TABLE statement is used to drop an existing table in a database.

Are temp tables dropped automatically?

Temp tables are automatically dropped as soon as they go out of scope (the proc that they were created in completes) or the connection that created them closes.

Can you update or delete data in a table using a join?

You can insert, update, and delete rows in a view, subject to the following limitations: If the view contains joins between multiple tables, you can only insert and update one table in the view, and you can’t delete rows. You can’t directly modify data in views based on union queries.