如何将数据从一个表复制到另一个表，其中列数据类型不同？

Question

I have two tables.

1. NEW [contains data] [all columns are varchar]

2. NEW2 [empty table] [columns are of different data types]

I want to copy all data from New to New2.

What i did is,

SELECT T.* 
INTO   #tmp 
FROM   (SELECT * 
        FROM   [dbo].[new]) AS T 

then

INSERT INTO New2(col1, col2....)
SELECT *
FROM #TMP

But its not working.

Msg 242, Level 16, State 3, Line 2
The conversion of a varchar data type to a smalldatetime data type resulted in an out-of-range value.
The statement has been terminated.

[what I want is to change the column data types of NEW table, especially the varchar to smalldatetime. So I tried this way. Any other approach is also welcome.]

Any help would be greatly appreciated.

Thank You.

Answer 1

Yes. Done.

What I did is, Imported Excle data in SQL Server table with all columns in a table as varchar data type. The problem was in excel data, the date values, somewhere was NA. So I had to replace all those NA values with null.

To check for those invalid date values in a table, I used following command.

SELECT ISDATE(COL_NAME) AS Result

SELECT ISNULL(COL_NAME) AS Result

For this, sometime you have to also check & set for the date format of SQL Server using following commands,

DBCC useroptions
SET DATEFORMAT mdy

Then all the result values I replaced them with NULL as

UPDATE TABLE SET COLUMN = NULL WHERE ISDATE(COLUMN) = 0 OR COLUMN = 'NA'

At last I updated required columns manually using simple alter commands as,

ALTER TABLE ALTER COLUMN COL_NAME <<data type>>

I also changed my dateforamat to dmy which prior was mdy.

Thank for Suraj Singh, Deepshikha for their helpful suggestions.

Answer 2

While inserting cast your column to smalldatetime

SET DATEFORMAT ymd 
INSERT INTO New2(col1, col2....)
SELECT Col1,Col2 , CAST('2007-05-08 12:35:29'  AS smalldatetime) As Col_Name,...Col3
FROM #TMP

Answer 3

Try as:

DECLARE @NEW TABLE([date] VARCHAR(20));

INSERT @NEW SELECT '2/8/2013 15:00' ;

select LEFT([date],2) + SUBSTRING([date],3,2) + SUBSTRING([date],5,4) + ' '+ RIGHT([date],5)+':00'
from @NEW 

UPDATE @NEW SET [date] = CONVERT(CHAR(16), CONVERT(SMALLDATETIME, 
                         LEFT([date],2) + SUBSTRING([date],3,2) + SUBSTRING([date],5,4) + ' '+ RIGHT([date],5)+':00', 120));

SELECT [date], CONVERT(SMALLDATETIME, [date]) FROM @NEW;

Answer 4

Try This

SET DATEFORMAT ymd 
INSERT INTO destination_table(column_name)
SELECT Column_name As Aliace_name
FROM Source_table