How do you delete multiple entries from a table?

How do you delete multiple entries from a table?

To remove one or more rows in a table:

1. First, you specify the table name where you want to remove data in the DELETE FROM clause.
2. Second, you put a condition in the WHERE clause to specify which rows to remove. If you omit the WHERE clause, the statement will remove all rows in the table.

How do you delete row if two rows are duplicate and we don’t have any primary key in the table?

So to delete the duplicate record with SQL Server we can use the SET ROWCOUNT command to limit the number of rows affected by a query. By setting it to 1 we can just delete one of these rows in the table. Note: the select commands are just used to show the data prior and after the delete occurs.

How to remove multiple rows from a table in Excel?

If you have multiply rows to delete and you don’t want to alter the structure of your tables you can use cursor. 1-You first need to select rows to delete (in a cursor) 2-Then for each row in the cursor you delete the referencing rows and after that delete the row him self.

When to delete data from a table with FKS?

There are generally two scenarios when deleting data from tables with FKs, one is to delete all of the data and the other is to delete a few records. Of course, for both scenarios we need to delete from the tables in the right order.

How to delete rows in tables that contain foreign keys to other tables?

Suppose there is a main table containing a primary key and there is another table which contains a foreign key to this main table. So if we delete the row of main table it will delete the child table also. How do I write this query? First, as a one-time data-scrubbing exercise, delete the orphaned rows e.g.

How to delete rows from a referencing table?

First, as a one-time data-scrubbing exercise, delete the orphaned rows e.g. DELETE FROM ReferencingTable WHERE NOT EXISTS ( SELECT * FROM MainTable AS T1 WHERE T1.pk_col_1 = ReferencingTable.pk_col_1 );