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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.
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.
Sep 26, 2008 · TRUNCATE is the DDL statement whereas DELETE is a DML statement. Below are the differences between the two: As TRUNCATE is a DDL (Data definition language) statement it does not require a commit to make the changes permanent. And this is the reason why rows deleted by truncate could not be rollbacked.
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.
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.
WHERE id IN (value1, value2, ...); If you need to delete based on the result of a query, you can also use IN: DELETE FROM your_table. WHERE id IN (select aColumn from ...); (Notice that the subquery must return only one column) If you need to delete based on a range of values, either you use BETWEEN or you use inequalities: DELETE FROM your_table.
