Merge datasets in a select

Question

Hello Everyone
I have the following situation:
We have a table that tracks all changes in the storage.
If someone moves an article from one storage to another there are to line inserted.
I want to merge the two line to one.
LFDLBNR from to
26088640     2     1052     10772          76     shop804     1     4004
26088640     1     1052     10772     78          shop804     1     4004
As you can see here in the movement with the number: 26088640, the article was moved from storage Nr. 78 to 76
I want to be able to create a view or do it just in the select merging the two rows into one like this:
26088640     1     1052     10772     78     76     shop804     1     4004
Edited by: 958274 on Sep 11, 2012 12:23 AM

Answer 1

Hi,
As Nicolas said, a regular join should do what you want.
If the employee's name is on one row of the names table, and the boss's name is on another row, you'll need to use two copies of the names table (as if there was one names table just for employees and another names table just for bosses).
If you're joining n tables, you'll want at least n-1 conditions in the WHERE clause linking the tables. In this case, you have three tables, so you need two join conditions:
SELECT  e.name
,       b.name  AS bossname
FROM    table1  t
,       names   e   -- employees
,       names   b   -- bosses
WHERE   t.name     = e.nameid  -- Join Condition #1
AND     t.bossname = b.nameid  -- Join Condition #2
AND     t.dataid   = 12345;