How Do I Update From An Existing Table To Another Existing Table Using Asp.Net

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i want to update from an existing table to another existing table using asp.net

table 1 have values.

table 2 have some null values..

i want to update table 2 comparing similar fields.
update those null values in table 2 .
i will copy from table1 to table2 (null fields)
and also mention the datatype..
table 2
date datetime

table1
data varchar(20)

Posted 23-Jul-14 5:58am

10923679

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CHill60 23-Jul-14 12:17pm

How are the tables linked?

10923679 23-Jul-14 12:22pm

both have common Fields ..
table1
emplyeecode
abc
bca

table 2
emplyeeid
abc
bca

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 23-Jul-14 13:40pm

What is your issue?

1 solution

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CHill60 · Accepted Answer · 2014-07-23T06:45:00

Solution 1

The construct you need is similar to this

SQL

UPDATE t2
SET t2.field1=t1.field1, t2.field2=t1.field2, etc
FROM table1 AS t1
INNER JOIN table2 as t2 ON t1.emplyeecode=t2.emplyeeid and t1.abc=t2.abc -- might be more
WHERE ... -- insert any condition here

Posted 23-Jul-14 6:45am

CHill60

Comments

10923679 24-Jul-14 5:19am

thank you so much its working..

can u help me with one more problem

i m also trying to update from one table to another
updating null values of table2 from table1

now my problem is

table1
date is varchar

table2
date is datetime

it is nt getting update .

any solution for this.
ASP.net

CHill60 24-Jul-14 15:51pm

Try t2.datefield=cast(t1.datefield AS DATE)

10923679 1-Aug-14 5:06am

ok.thnq