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2. TRUNCATE TABLE table_name. Is a DDL (Data Definition Language), you can delete all data and clean identity. If you want to use this, you need DDL privileges in table. DDL statements example: CREATE, ALTER, DROP, TRUNCATE, etc. DELETE FROM table_name / DELETE FROM table_name WHERE 1=1 (is the same) Is a DML (Data Manipulation Language), you ...
delete from YOUR_TABLE where your_date_column < '2009-01-01'; This will delete rows from YOUR_TABLE where the date in your_date_column is older than January 1st, 2009. i.e. a date with 2008-12-31 would be deleted.
9. Delete v/s Drop. Delete statement performs conditional based deletion, whereas Drop command deletes entire records in the table. Delete statement removes only the rows in the table and it preserves the table structure as same, and Drop command removes all the data in the table and the table structure.
Nov 24, 2011 · 1. Usefull script which you can delete all data in all tables of a database , replace tt with you databse name : declare @tablename nvarchar(100) declare c1 cursor for. SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_CATALOG='tt' AND TABLE_TYPE='BASE TABLE'. open c1. fetch next from c1 into @tablename.
Jun 24, 2021 · 5. The SQL TRUNCATE TABLE command is used to delete complete data from an existing table. You can also use DROP TABLE command to delete complete table but it would remove complete table structure form the database and you would need to re-create this table once again if you wish you store some data. Syntax:
First, insert an identity column in that table by using the following code: ALTER TABLE dbo.ATTENDANCE ADD AUTOID INT IDENTITY(1,1) Use the following code to resolve it: DELETE FROM dbo.ATTENDANCE WHERE AUTOID NOT IN (SELECT MIN(AUTOID) _. FROM dbo.ATTENDANCE GROUP BY EMPLOYEE_ID,ATTENDANCE_DATE)
Apr 20, 2017 · You don't want to delete if you're wanting to leave the row itself intact. You want to update the row, and change the column value. The general form for this would be an UPDATE statement:
There is no solution in ANSI SQL to use joins in deletes, AFAIK. DELETE FROM Table1. WHERE Table1.id IN (SELECT Table2.id FROM Table2) Later edit. Other solution (sometimes performing faster): DELETE FROM Table1. WHERE EXISTS( SELECT 1 FROM Table2 Where Table1.id = Table2.id) edited Oct 19, 2009 at 20:25.
Nov 10, 2014 · 7. Drop will do just that....drop the table in question, unless the table is a parent to another table. Delete will remove all the data that meets the condition; if no condition is specified, it'll remove all the data in the table. Truncate is similar to delete; however, it resets the auto_increment counter back to 1 (or the initial starting ...
Dec 13, 2013 · I'm a bit late, just for reference. If You are using SQL Server Management Studio, You could generate a DROP and RECREATE script with "Keep schema and data" option. Right click on the desired DB in object explorer. Tasks > Generate scripts. Select the table you want to script. Then clicking on Advanced button.
