INSERT Statement

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INSERT Statement

nulad01

SSC-Addicted

Points: 412
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June 27, 2013 at 8:53 am

#279179

I am looking to insert data into a table if the data is not already in the table. Is the below the correct statement to accomplish this?
INSERT INTO DSD
(req_id
,value
,comments
,create_date
,modify_date
,modify_by
,peps_id
,place_id
,act_date
)
SELECT DISTINCT
smf6.req_id
,smf6.value
,smf6.comments
,smf6.create_date
,smf6.modify_date
,smf6.modify_by
,smf6.student_id
,smf6.place_id
,smf6.act_date
FROM smf6
WHERE (smf6.RespID + smf6.req_id + smf6.peps_id)
NOT IN (SELECT DSD.modify_by, DSD.req_id + DSD.peps_id
from DSD)

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Lowell SSC Guru Points: 323506 More actions · Answer 1

i typically join the table against the insert/target table with a left join

it seems like the unique criteria you are using is the three columns i'm using in the join? is that right?

INSERT INTO DSD (

req_id,

value,

comments,

create_date,

modify_date,

modify_by,

peps_id,

place_id,

act_date

)

SELECT DISTINCT smf6.req_id,

smf6.value,

smf6.comments,

smf6.create_date,

smf6.modify_date,

smf6.modify_by,

smf6.student_id,

smf6.place_id,

smf6.act_date

FROM smf6

LEFT JOIN DSD

ON smf6.modify_by = DSD.modify_by

AND smf6.req_id = DSD.req_id

AND smf6.peps_id = DSD.peps_id

WHERE DSD.req_id IS NULL --no match found

Lowell

--help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible!

ChrisM@Work SSC Guru Points: 186127 More actions · Answer 2

Or NOT EXISTS. Both compare columns individually rather than concatenating them together which can give rise to false matches.

WHERE NOT EXISTS (

SELECT 1 FROM DSD

WHERE DSD.modify_by = smf6.RespID AND DSD.req_id = smf6.req_id AND DSD.peps_id = smf6.peps_id)

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

rchantler SSCrazy Points: 2128 More actions · Answer 3

You could do something like

insert into tab1

select ________ from tab2

except

select ________ from tab1