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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.
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.
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 25, 2015 · Lets store it in a variable 'min_primary'. Insert all the rows having primary key > min_primary into a staging table (memory table if no. of rows is not large). Drop the large table. Recreate the table. Copy all the rows from staging table to main table. Drop the staging table. answered Aug 29, 2017 at 9:46.
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:
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:
The DELETE statement removes rows one at a time and records an entry in the transaction log for each deleted row. TRUNCATE TABLE removes the data by deallocating the data pages used to store the table data and records only the page deallocations in the transaction log. Fewer locks are typically used.
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 ...
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)
