2015年10月18日 · I am new to SQL and I was looking at the DELETE keyword. I want to know how can I delete multiple rows in one go. Eg I want to delete CategoryID 2,3,5. I am trying . DELETE FROM Categories WHERE CategoryID="2"AND CategoryID="3" AND CategoryID="5"; but no rows and deleted. And if I use OR then everything gets deleted. Table name Categories

2009年4月9日 · delete from dd from ( select *, row = row_number() over (order by (select 1)) from my_table ) dd where row = 1 Note that the (select 1) makes it the sort order that the tables or indexes are in. You can replace that with a newid to get fairly random rows.

2015年9月10日 · This query uses a subquery to identify the MAX(row_id) for each group_id and then deletes the rows matching both the group_id and the maximum row_id. DELETE FROM your_table WHERE (group_id, row_id) IN ( SELECT group_id, MAX(row_id) FROM your_table GROUP BY group_id );

2013年5月8日 · You can simply repeat the DELETE statement until the number of affected rows is less than the LIMIT value. Therefore, you could use DELETE FROM some_table WHERE x="y" AND foo="bar" LIMIT 1; note that there isn't a simple way to say "delete everything except one" - just keep checking whether you still have row duplicates.

2013年7月9日 · 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 YOUR_TABLE where your_date_column < '2009-01-01'; This will delete rows from YOUR_TABLE where the date in your_date_column is older than January 1st, 2009. i.e. a date with 2008-12-31 would be deleted.

I am trying to run a SQL query to delete rows with id's 163 to 265 in a table. I tried this to delete less number of rows. DELETE FROM `table` WHERE id IN (264, 265) But when it comes to delete 100's of rows at a time, Is there any query similar to above method I am also trying to use this kind of query but failed to execute it. DELETE FROM ...

2020年8月30日 · I need to delete pre-existing records from the SQL Table from pandas SQL query. For Example. SQL table: Id Name Qualification 1 Rick Lawyer 2 John Engg 3 Gini Doctor 4 Bist Architect 5 mady lawyer df: Id Name Qualification 3 Gini Engg 4 Bist Lawyer

2014年6月13日 · Since for each row at least one of the sub-conditions will (likely) be true, the row is deleted. DBs do this for a couple of reasons: 1) it's actually due to dbs thinking in "sets", essentially matching records 2) it allows the db to choose which condition to evaluate first, allowing queries to be faster.

2011年11月24日 · To delete data from the tables having relationship of parent_child, First you have to delete the data from the child table by mentioning join then simply delete the data from the parent table, example is given below: DELETE ChildTable FROM ChildTable inner join ChildTable on PParentTable.ID=ChildTable.ParentTableID WHERE <WHERE CONDITION ...