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Posted on 2001-09-05
Medium Priority
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Table1?F
ID    starttime  overtime
A01   2001-9-4  2001-9-6
B01   2001-9-3  2001-9-5

Table2?F
ID    state  Num
A01    A     5
A01    B     3
B01    A     4
B01    B     2

Query result ?F

Time      state  Num
2001-9-3   A     4
2001-9-3   B     2
2001-9-4   A     9
2001-9-4   B     5
2001-9-5   A     9
2001-9-5   B     5
2001-9-6   A     5
2001-9-6   B     3

How to write this 'SQL' sentence ?
0
Question by:lingxin
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LVL 44

Expert Comment

ID: 6459490
SQL.Add('SELECT Table1?F.ID, Table1?F.starttime, Table1?F.overtime, Table2?F.State, Table2?F.Num');
SQL.Add('FROM Table2?F INNER JOIN Table1?F ON Table2?F.Id = ''Table1?F.Id''');

The Crazy One
0

LVL 44

Accepted Solution

CrazyOne earned 400 total points
ID: 6459508
Oops sorry I see you don't want the ID or the overtime. And made a few other mistakes so disregard my first comment.

with Query1 do begin
Close;
SQL.Clear;
SQL.Add('FROM Table1?F INNER JOIN Table2?F ON Table1?F.Id = Table2?F.Id');
If not Prepared then Prepare;
Open;
First;
end;
0

LVL 2

Assisted Solution

lucika earned 400 total points
ID: 6459701
If the tables to set so:

Table1?F
ID    starttime  overtime
A01   2001-9-4  2001-9-7
B01   2001-9-3  2001-9-6

Table2?F
ID    state  Num
A01    A     5
A01    B     3
B01    A     4
B01    B     2

What result of query will be exact?
1) or 2)?

1)
Time      state  Num
2001-9-3   A     4
2001-9-3   B     2
2001-9-4   A     9
2001-9-4   B     5
2001-9-5   A     9
2001-9-5   B     5
2001-9-6   A     9
2001-9-6   B     5
2001-9-7   A     5
2001-9-7   B     3

2)
Time      state  Num
2001-9-3   A     4
2001-9-3   B     2
2001-9-4   A     9
2001-9-4   B     5
2001-9-6   A     9
2001-9-6   B     5
2001-9-7   A     5
2001-9-7   B     3

0

LVL 2

Expert Comment

ID: 6459872
SELECT T3.starttime, Table2?F.State, sum(Table2?F.Num)
FROM Table1?F t3, Table1?F INNER JOIN Table2?F ON Table1?F.Id = Table2?F.Id
where t3.starttime between Table1?F.starttime and Table1?F.overtime
group by t3.starttime, Table2?F.state

union

SELECT T3.overtime, Table2?F.State, sum(Table2?F.Num)
FROM Table1?F t3, Table1?F INNER JOIN Table2?F ON Table1?F.Id = Table2?F.Id
where t3.overtime between Table1?F.starttime and Table1?F.overtime
group by t3.overtime, Table2?F.state;
0

LVL 2

Expert Comment

ID: 6460287
It would be desirable to hear your commentings.
0

LVL 6

Expert Comment

ID: 6461273
What's this got to do with Delphi?
0

LVL 10

Expert Comment

ID: 6461721
What database do you want to use? And a answer to lucika first comment is required...

Regards Jacco

0

Expert Comment

ID: 6463938
Table1?F
ID    starttime  overtime
A01   2001-9-4  2001-9-7
B01   2001-9-3  2001-9-6

Table2?F
ID    state  Num
A01    A     5
A01    B     3
B01    A     4
B01    B     2

SQL will not produce a result from every record in table1, using INNER JOIN, if there is not an entry in Table2 for every possible ID.
So LEFT JOIN may be better

SELECT a.overtime,b.state,b.Num
FROM Table1 a
LEFT JOIN Table2 on a.ID = b.ID

Cheers
0

LVL 17

Expert Comment

ID: 9295533
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

split points between CrazyOne and lucika

Thanks,

geobul
EE Cleanup Volunteer
0

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