I have 2 tables (A, B). They each have a different column that is basically an order or a sequence number. Table A has 'Sequence' and the values range from 0 to 5. Table B has 'Index' and the values are 16740, 16744, 16759, 16828, 16838, and 16990. Unfortunately I do not know the significance of these values. But I do believe they will always match in sequential order. I want to join these tables on these numbers where 0 = 16740, 1 = 16744, etc. Any ideas?
Thanks
You could use a case expression to convert table a's values to table b's values (or vise-versa) and join on that:
SELECT *
FROM a
JOIN b ON a.[sequence] = CASE b.[index] WHEN 16740 THEN 0
WHEN 16744 THEN 1
WHEN 16759 THEN 2
WHEN 16828 THEN 3
WHEN 16838 THEN 4
WHEN 16990 THEN 5
ELSE NULL
END;
#Mureinik has a great example. If down the road you do end up adding more numbers maybe putting this information into a new table would be a good idea.
CREATE TABLE C(
AInfo INT,
BInfo INT
)
INSERT INTO TABLE C(AInfo,BInfo) VALUES(0,16740)
INSERT INTO TABLE C(AInfo,BInfo) VALUES(1,16744)
etc
Then you can Join all the tables.
If the values are in ascending order as per your example, you can use the ROW_NUMBER() function to achieve this:
;with cte AS (SELECT *, ROW_NUMBER() OVER(ORDER BY [Index])-1 RN
FROM B)
SELECT *
FROM cte
Related
I have the following table:
EventID=00002,DocumentID=0005,EventDesc=ItemsReceived
I have the quantity in another table
DocumentID=0005,Qty=20
I want to generate a result of 20 lines (depending on the quantity) with an auto generated column which will have a sequence of:
ITEM_TAG_001,
ITEM_TAG_002,
ITEM_TAG_003,
ITEM_TAG_004,
..
ITEM_TAG_020
Here's your sql query.
with cte as (
select 1 as ctr, t2.Qty, t1.EventID, t1.DocumentId, t1.EventDesc from tableA t1
inner join tableB t2 on t2.DocumentId = t1.DocumentId
union all
select ctr + 1, Qty, EventID, DocumentId, EventDesc from cte
where ctr <= Qty
)select *, concat('ITEM_TAG_', right('000'+ cast(ctr AS varchar(3)),3)) from cte
option (maxrecursion 0);
Output:
Best is to introduce a numbers table, very handsome in many places...
Something along:
Create some test data:
DECLARE #MockNumbers TABLE(Number BIGINT);
DECLARE #YourTable1 TABLE(DocumentID INT,ItemTag VARCHAR(100),SomeText VARCHAR(100));
DECLARE #YourTable2 TABLE(DocumentID INT, Qty INT);
INSERT INTO #MockNumbers SELECT TOP 100 ROW_NUMBER() OVER(ORDER BY (SELECT NULL)) FROM master..spt_values;
INSERT INTO #YourTable1 VALUES(1,'FirstItem','qty 5'),(2,'SecondItem','qty 7');
INSERT INTO #YourTable2 VALUES(1,5), (2,7);
--The query
SELECT CONCAT(t1.ItemTag,'_',REPLACE(STR(A.Number,3),' ','0'))
FROM #YourTable1 t1
INNER JOIN #YourTable2 t2 ON t1.DocumentID=t2.DocumentID
CROSS APPLY(SELECT Number FROM #MockNumbers WHERE Number BETWEEN 1 AND t2.Qty) A;
The result
FirstItem_001
FirstItem_002
[...]
FirstItem_005
SecondItem_001
SecondItem_002
[...]
SecondItem_007
The idea in short:
We use an INNER JOIN to get the quantity joined to the item.
Now we use APPLY, which is a row-wise action, to bind as many rows to the set, as we need it.
The first item will return with 5 lines, the second with 7. And the trick with STR() and REPLACE() is one way to create a padded number. You might use FORMAT() (v2012+), but this is working rather slowly...
The table #MockNumbers is a declared table variable containing a list of numbers from 1 to 100. This answer provides an example how to create a pyhsical numbers and date table. Any database should have such a table...
If you don't want to create a numbers table, you can search for a tally table or tally on the fly. There are many answers showing approaches how to create a list of running numbers...a
Am working with PostgreSQL 8.0.2, I have table
create table rate_date (id serial, rate_name text);
and it's data is
id rate_name
--------------
1 startRate
2 MidRate
3 xlRate
4 xxlRate
After select it will show data with default order or order by applied to any column of same table. My requirement is I have separate entity from where I will get data as (xlRate, MidRate,startRate,xxlRate) so I want to use this data to sort the select on table rate_data. I have tried for values join but it's not working and no other solution am able to think will work. If any one have idea please share detail.
Output should be
xlRate
MidRate
startRate
xxlRate
my attempt/thinking.
select id, rate_name
from rate_date r
join (
VALUES (1, 'xlRate'),(2, 'MidRate')
) as x(a,b) on x.b = c.rate_name
I am not sure if this is helpful but in Oracle you could achieve that this way:
select *
from
(
select id, rate_name,
case rate_name
when 'xlRate' then 1
when 'MidRate' then 2
when 'startRate' then 3
when 'xxlRate' then 4
else 100
end my_order
from rate_date r
)
order by my_order
May be you can do something like this in PostgreSQL?
I have a table and i would like to replicate/clone records within the same table. However i would like to do that with a condition. And the condition is i have a column called recordcount with numeric values. For example Row 1 can take on a value of recordcount say 7, then i would like my row 1 to be replicated 7 times. Row 2 could take on a value say 9 then i would like row 2 to be replicated 9 times.
Any help is appreciated. Thank you
What you can do (and I'm pretty sure it's not a best practice),
Is to hold a table with just numbers, which has rowcount that correspond to the numeric value.
Join that with your table, and project your table only.
Example:
create table nums(x int);
insert into nums select 1;
insert into nums select 2;
insert into nums select 2;
insert into nums select 3;
insert into nums select 3;
insert into nums select 3;
create table t (txt varchar(10) , recordcount int);
insert into t select 'A',1;
insert into t select 'B',2;
insert into t select 'C',3;
select t.*
from t
inner join nums
on t.recordcount = nums.x
order by 1
;
Will project:
"A",1
"B",2
"B",2
"C",3
"C",3
"C",3
I know that it's possible in other SQL flavors (T-SQL) to "select" provided data without a table. Like:
SELECT *
FROM (VALUES (1,2), (3,4)) tbl
How can I do this using Teradata?
Teradata has strange syntax for this:
select t.*
from (select * from (select 1 as a, 2 as b) x
union all
select * from (select 3 as a, 4 as b) x
) t;
I don't have access to a TD system to test, but you might be able to remove one of the nested SELECTs from the answer above:
select x.*
from (
select 1 as a, 2 as b
union all
select 3 as a, 4 as b
) x
If you need to generate some random rows, you can always do a SELECT from a system table, like sys_calendar.calendar:
SELECT 1, 2
FROM sys_calendar.calendar
SAMPLE 10;
Updated example:
SELECT TOP 1000 -- Limit to 1000 rows (you can use SAMPLE too)
ROW_NUMBER() OVER() MyNum, -- Sequential numbering
MyNum MOD 7, -- Modulo operator
RANDOM(1,1000), -- Random number between 1,1000
HASHROW(MyNum) -- Rowhash value of given column(s)
FROM sys_calendar.calendar; -- Use as table to source rows
A couple notes:
make sure you pick a system table that will always be present and have rows
if you need more rows than are available in the source table, do a UNION to get more rows
you can always easily create a one-column table and populate it to whatever number of rows you want by INSERT/SELECT into it:
CREATE DummyTable (c1 INT); -- Create table
INSERT INTO DummyTable(1); -- Seed table
INSERT INTO DummyTable SELECT * FROM DummyTable; -- Run this to duplicate rows as many times are you want
Then use this table to create whatever resultset you want, similar to the query above with sys_calendar.calendar.
I don't have a TD system to test so you might get syntax errors...but that should give you a basic idea.
I am a bit late to this thread, but recently got the same error.
I solved this by simply using
select distinct 1 as a, 2 as b from DBC.tables
union all
select distinct 3 as a, 4 as b from DBC.tables
Here, DBC.tables is a DB backend table with a few rows only. So, the query runs fast as well
I have two SQL temp tables #Temp1 and #Temp2.
I want to get entryno which contain set of temp table two.
For example: #Temp2 has 8 records. I want to search in #Temp1 which contains a set of records from #Temp1.
CREATE TABLE #Temp1 (entryNo INT, setid INT, measurid INT,measurvalueid int)
CREATE TABLE #Temp2(setid INT, measurid INT,measurvalueid int)
INSERT INTO #Temp1 (entryNo,setid,measurid,measurvalueid )
VALUES (1,400001,1,1),
(1,400001,2,110),
(1,400001,3,1001),
(1,400001,4,1100),
(2,400002,5,100),
(2,400002,6,102),
(2,400002,7,1003),
(2,400002,8,10004),
(3,400001,1,1),
(3,400001,2,110),
(3,400001,3,1001),
(3,400001,4,1200)
INSERT INTO #Temp2 (setid,measurid,measurvalueid )
VALUES (400001,1,1),
(400001,2,110),
(400001,3,1001),
(400001,4,1100),
(400002,5,100),
(400002,6,102),
(400002,7,1003),
(400002,8,10004)
I want output
EntryNo
1
2
It contains two sets.
One is:
(400001,1,1),
(400001,2,110),
(400001,3,1001),
(400001,4,1100)
The second is:
(400002,5,100),
(400002,6,102),
(400002,7,1003),
(400002,8,10004)
Try this:
WITH DataSourceInialData AS
(
SELECT *
,COUNT(*) OVER (PARTITION BY [entryNo], [setid]) AS [GroupCount]
FROM #Temp1
), DataSourceFilteringData AS
(
SELECT *
,COUNT(*) OVER (PARTITION BY [setid]) AS [GroupCount]
FROM #Temp2
)
SELECT A.[entryNo]
FROM DataSourceInialData A
INNER JOIN DataSourceFilteringData B
ON A.[setid] = B.[setid]
AND A.[measurid] = B.[measurid]
AND A.[measurvalueid] = B.[measurvalueid]
-- we are interested in groups which are passed completely by the filtering groups
AND A.[GroupCount] = B.[GroupCount]
GROUP BY A.[entryNo]
-- aftering joining the rows, the filtered rows must match the filtering rows
HAVING COUNT(A.[setid]) = MAX(B.[GroupCount]);
The algorithm is simple:
we count how many rows exists per data group
we count how many rows exists per filtering group
we join the initial data and the filtering data
after the join we count how many rows are left in the initial data and if there count is equal to the filtering count for the given group
and the result is:
Note, that I am checking for each match. For example, if in your sample data, there is one more row for entryNo = 1 it won't be included in the result. In order to change this behavior, comment this row:
-- we are interested in groups which are passed completely by the filtering groups
AND A.[GroupCount] = B.[GroupCount]