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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 can delete all data.
In the delete object GUI, on top there is a 'script' option which gives the t-sql statement which is plain drop table statement. Where as when you go for the drop table option, the t-sql generated would perform drop only if the table exists in the sys.objects table.
You have to drop the constraint before drop your table. You can use those queries to find all FKs in your table and find the FKs in the tables in which your table is used. Declare @SchemaName VarChar(200) = 'Your Schema name' Declare @TableName VarChar(200) = 'Your Table Name' -- Find FK in This table.
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];
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.
View -> SQL Server Object Explorer. it should open like shown here. Select and Right Click the Table you wish to delete, then delete. Such a screen should be displayed. Click Update Database to confirm. This method is very safe as it gives you the feedback and will warn of any relations of the deleted table with other tables.
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):
DELETE FROM TableName WHERE ID NOT IN (SELECT MAX(ID) FROM TableName GROUP BY Column1, Column2, Column3 /*Even if ID is not null-able SQL Server treats MAX(ID) as potentially nullable. Because of semantics of NOT IN (NULL) including the clause below can simplify the plan*/ HAVING MAX(ID) IS NOT NULL)
Sep 18, 2008 · Delete the duplicates from the original table: DELETE t1 FROM t1, holdkey WHERE t1.col1 = holdkey.col1 AND t1.col2 = holdkey.col2 Insert the original rows: INSERT t1 SELECT * FROM holddups btw and for completeness: In Oracle there is a hidden field you could use (rowid):
For this foreign key, we have specified the ON DELETE CASCADE clause which tells SQL Server to delete the corresponding records in the child table when the data in the parent table is deleted. So in this example, if a product_id value is deleted from the products table, the corresponding records in the inventory table that use this product_id will also be deleted.
