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PONeed a SQL statement focus on combination of tables but entries always with unique ID
 

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  1. PONeed a SQL statement focus on combination of tables but entries always with unique ID
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    <p>I need SQL code to solve the tables combination problem, described on below:</p> <p>Table old data: table old</p> <pre><code> name version status lastupdate ID A 0.1 on 6/8/2010 1 B 0.1 on 6/8/2010 2 C 0.1 on 6/8/2010 3 D 0.1 on 6/8/2010 4 E 0.1 on 6/8/2010 5 F 0.1 on 6/8/2010 6 G 0.1 on 6/8/2010 7 </code></pre> <p>Table new data: table new</p> <pre><code> name version status lastupdate ID A 0.1 on 6/18/2010 #B entry deleted C 0.3 on 6/18/2010 #version_updated C1 0.1 on 6/18/2010 #new_added D 0.1 on 6/18/2010 E 0.1 off 6/18/2010 #status_updated F 0.1 on 6/18/2010 G 0.1 on 6/18/2010 H 0.1 on 6/18/2010 #new_added H1 0.1 on 6/18/2010 #new_added </code></pre> <p>the difference of new data and old date:</p> <p>B entry deleted</p> <p>C entry version updated</p> <p>E entry status updated</p> <p>C1/H/H1 entry new added</p> <p>What I want is always keeping the ID - name mapping relationship in old data table no matter how data changed later, a.k.a the name always has an unique ID number bind with it. </p> <p>If entry has update, then update the data, if entry is new added, insert to the table then give a new assigned unique ID. If the entry was deleted, delete the entry and do not reuse that ID later.</p> <p>However, I can only use SQL with simple select or update statement then it may too hard for me to write such code, then I hope someone with expertise can give direction, no details needed on the different of SQL variant, a standard sql code as sample is enough.</p> <p>Thanks in advance!</p> <p>Rgs</p> <p>KC</p> <p>======== I listed my draft sql here, but not sure if it works, some one with expertise pls comment, thanks!</p> <h1>1.duplicate old table as tmp for store updates</h1> <p>create table tmp as select * from old </p> <h1>2.update into tmp where the "name" is same in old and new table</h1> <p>update tmp where name in (select name from new)</p> <h1>3.insert different "name" (old vs new) into tmp and assign new ID</h1> <p>insert into tmp (name version status lastupdate ID) set idvar = max(select max(id) from tmp) + 1 select * from (select new.name new.version new.status new.lastupdate new.ID from old, new where old.name &lt;> new.name)</p> <h1>4. delete the deleted entries from tmp table (such as B)</h1> <p>delete from tmp where (select ???)</p>
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    1. USgkrogers
    1. USK. C
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      1. PONeed a SQL statement focus on combination of tables but entries always with unique ID
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    1. COYou do not have the ID in the new data table?
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      1. UStzup
    2. COYour sample output is not indicative of what you expect given your description. Is it the case that you want the ID's to remain sequential?
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      1. USThomas
    3. COIn addition, what database product and version are you using?
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      1. USThomas
 

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