Insert Multiple Records Using One Insert Statement

How can I insert multiple values in table using only one insert? Now this is interesting question. When there are multiple records are to be inserted in the table following is the common way using T-SQL.

USE YourDB
GO
INSERT INTO MyTable  (FirstColSecondCol)
        VALUES (‘First’,1);
INSERT INTO MyTable  (FirstColSecondCol)
        VALUES (‘Second’,2);
INSERT INTO MyTable  (FirstColSecondCol)
        VALUES (‘Third’,3);
INSERT INTO MyTable  (FirstColSecondCol)
        VALUES (‘Fourth’,4);
INSERT INTO MyTable  (FirstColSecondCol)
        VALUES (‘Fifth’,5);
GO

The clause INSERT INTO is repeated multiple times. Many times DBA copy and paste it to save time. There is another alternative to this, which I use frequently. I use UNION ALL and INSERT INTO … SELECT… clauses. Regarding performance there is not much difference. If there is performance difference it does not matter as I use this for one time insert script. I enjoy writing this way, as it keeps me focus on task, instead of copy paste. I have explained following script to new developer. He was quite pleased.

USE YourDB
GO
INSERT INTO MyTable  (FirstColSecondCol)
    SELECT  ‘First’ ,1
    UNION ALL
SELECT  ‘Second’ ,2
    UNION ALL
SELECT  ‘Third’ ,3
    UNION ALL
SELECT  ‘Fourth’ ,4
    UNION ALL
SELECT  ‘Fifth’ ,5
GO

The effective result is same.

Ref :- http://blog.sqlauthority.com

Diffrence between DELETE TABLE and TRUNCATE TABLE commands

DELETE TABLE is a logged operation, so the deletion of each row gets logged in the transaction log, which makes it slow. TRUNCATE TABLE also deletes all the rows in a table, but it won’t log the deletion of each row, instead it logs the deallocation of the data pages of the table, which makes it faster. Of course, TRUNCATE TABLE can be rolled back. TRUNCATE TABLE is functionally identical to DELETE statement with no WHERE clause: both remove all rows in the table. But TRUNCATE TABLE is faster and uses fewer system and transaction log resources than DELETE. The DELETE statement removes rows one at a time and records an entry in the transaction log for each deleted row. TRUNCATE TABLE removes the data by deallocating the data pages used to store the table’s data, and only the page deallocations are recorded in the transaction log. TRUNCATE TABLE removes all rows from a table, but the table structure and its columns, constraints, indexes and so on remain. The counter used by an identity for new rows is reset to the seed for the column. If you want to retain the identity counter, use DELETE instead. If you want to remove table definition and its data, use the DROP TABLE statement. You cannot use TRUNCATE TABLE on a table referenced by a FOREIGN KEY constraint; instead, use DELETE statement without a WHERE clause. Because TRUNCATE TABLE is not logged, it cannot activate a trigger. TRUNCATE TABLE may not be used on tables participating in an indexed view.