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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 ...
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.
The Best Answer to dropping the table containing foreign constraints is : Step 1 : Drop the Primary key of the table. Step 2 : Now it will prompt whether to delete all the foreign references or not. Step 3 : Delete the table. edited Apr 25, 2014 at 19:53.
Sep 26, 2008 · DELETE Statement: This command deletes only the rows from the table based on the condition given in the where clause or deletes all the rows from the table if no condition is specified. But it does not free the space containing the table. The Syntax of a SQL DELETE statement is: DELETE FROM table_name [WHERE condition];
9. SQL Server 2016 and above the best and simple one is DROP TABLE IF EXISTS [TABLE NAME] Ex: DROP TABLE IF EXISTS dbo.Scores. if suppose the above one is not working then you can use the below one. IF OBJECT_ID('dbo.Scores', 'u') IS NOT NULL. DROP TABLE dbo.Scores; edited Mar 31, 2022 at 18:22.
Without exception, zero pages are left in the table. After a DELETE statement is executed, the table can still contain empty pages. For example, empty pages in a heap cannot be deallocated without at least an exclusive (LCK_M_X) table lock. If the delete operation does not use a table lock, the table (heap) will contain many empty pages.
Jul 9, 2013 · Your second DELETE query was nearly correct. Just be sure to put the table name (or an alias) between DELETE and FROM to specify which table you are deleting from. This is simpler than using a nested SELECT statement like in the other answers. Corrected Query (option 1: using full table name):
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)
Sep 18, 2008 · GROUP BY col1, col2. HAVING count(*) > 1. If there are only few, you can delete them manually: set rowcount 1. delete from t1. where col1=1 and col2=1. The value of "rowcount" should be n-1 times the number of duplicates. In this example there are 2 dulpicates, therefore rowcount is 1.
Nov 20, 2015 · 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:
