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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 ...
5 Νοε 2011 · The canonical T-SQL (SqlServer) answer is to use a DELETE with JOIN as such. DELETE o. FROM Orders o. INNER JOIN Customers c. ON o.CustomerId = c.CustomerId. WHERE c.FirstName = 'sklivvz'. This will delete all orders which have a customer with first name Sklivvz. edited Nov 19, 2012 at 9:59.
9 Ιουλ 2013 · 182. You need to identify the primary key in TableA in order to delete the correct record. The primary key may be a single column or a combination of several columns that uniquely identifies a row in the table. If there is no primary key, then the ROWID pseudo column may be used as the primary key. DELETE FROM tableA WHERE ROWID IN ( SELECT q ...
4 Ιουλ 2015 · 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:
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)
10 Σεπ 2016 · Another way is using CTE: ;WITH cte AS (SELECT * FROM workrecord2 w WHERE EXISTS (SELECT 1 FROM employee e WHERE employeerun = employeeno AND company = '1' AND date = '2013-05-06')) DELETE FROM cte. Note: We cannot use JOIN inside CTE when you want to delete. edited Jan 16, 2021 at 1:24. Peter Mortensen.
26 Σεπ 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.
You can do this with SQL Server Management Studio. → Right click the table design and go to Relationships and choose the foreign key on the left-side pane and in the right-side pane, expand the menu "INSERT and UPDATE specification" and select "Cascade" as Delete Rule. edited Nov 12, 2014 at 20:39. senshin.
18 Σεπ 2008 · First find the duplicate rows: SELECT col1, col2, count (*) FROM t1 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 ...
This is done primarily because in SQL Azure, each table has to have a primary key and identity defined. But since I have to delete some records from the table, the identity seed for those tables will be disturbed and the index column (which is auto-generated with an increment of 1) will get disturbed.
