I have a MS Access table in Access 2003 database named Comments and a column named Sequence Number in the Comments table. The Sequence Number column has numbers ranging from 1 to 20000. However, there are certain numbers missing from the Sequence Number column and I want to be able to view the numbers that are missing, e.g below I want to run a access query to see that 4 is missing.
Sequence Number
1
2
3
5
6
I'm using the following Access query in SQL view to get what I want.
SELECT ([Sequence Number]+1) AS MissingFrom, DMin("Sequence Number","Comments","Sequence Number>" & [Sequence Number]) AS MissingUntil
FROM Comments
WHERE (((DMin("Sequence Number","Comments","Sequence Number>" & [Sequence Number]))<>([Sequence Number]+1)));
However, when I run the query, I get the following error:
Syntax error (missing operator) in query expression 'Min(Sequence Number)'.
Can someone please point out what is causing the query to fail? Thanks!
With NOT EXISTS:
SELECT MIN([Sequence Number]) + 1
FROM Comments AS c
WHERE
c.[Sequence Number] < (SELECT MAX([Sequence Number]) FROM Comments)
AND NOT EXISTS (
SELECT 1 FROM Comments
WHERE [Sequence Number] = c.[Sequence Number] + 1
)
You can get the first in a missing series using:
select num + 1
from comments
where num + 1 not in (select num from comments) and
num + 1 <> (select max(num) from comments);
Related
I've come across following T-SQL today:
select c from (select 1 union all select 1) as d(c)
that yields following result:
c
-----------
1
1
The part that got me confused was d(c)
While trying to understand what's going on I've modified T-SQL into:
select c, b from (select 1, 2 union all select 3, 4) m(c, b)
which yields following result:
c b
----------- -----------
1 2
3 4
It was clear that d & m are table reference while letters in brackets c & b are reference to columns.
I wasn't able to find relevant documentation on msdn, but curious if
You're aware of such syntax?
What would be useful use case scenario?
select c from (select 1 union all select 1) as d(c)
is the same as
select c from (select 1 as c union all select 1) as d
In the first query you did not name the column(s) in your subquery, but named them outside the subquery,
In the second query you name the column(s) inside the subquery
If you try it like this (without naming the column(s) in the subquery)
select c from (select 1 union all select 1) as d
You will get following error
No column name was specified for column 1 of 'd'
This is also in the Documentation
As for the usage, some like to write it the first method, some in the second, whatever you prefer. It's all the same
An observation: Using the table constructor values gives you no way of naming the columns, which makes it neccessary to use column naming after the table alias:
select * from
(values
(1,2) -- can't give a column name here
,(3,4)
) as tableName(column1,column2) -- gotta do it here
You've already had comments that point you to the documentation of how derived tables work, but not to answer you question regarding useful use cases for this functionality.
Personally I find this functionality to be useful whenever I want to create a set of addressable values that will be used extensively in your statement, or when I want to duplicate rows for whatever reason.
An example of addressable values would be a much more compelx version of the following, in which the calculated values in the v derived table can be used many times over via more sensible names, rather than repeated calculations that will be hard to follow:
select p.ProductName
,p.PackPricePlusVAT - v.PackCost as GrossRevenue
,etc
from dbo.Products as p
cross apply(values(p.UnitsPerPack * p.UnitCost
,p.UnitPrice * p.UnitsPerPack * 1.2
,etc
)
) as v(PackCost
,PackPricePlusVAT
,etc
)
and an example of being able to duplicate rows could be in creating an exception report for use in validating data, which will output one row for every DataError condition that the dbo.Product row satisfies:
select p.ProductName
,e.DataError
from dbo.Products as p
cross apply(values('Missing Units Per Pack'
,case when p.SoldInPacks = 1 and isnull(p.UnitsPerPack,0) < 1 then 1 end
)
,('Unusual Price'
,case when p.Price > (p.UnitsPerPack * p.UnitCost) * 2 then 1 end
)
,(etc)
) as e(DataError
,ErrorFlag
)
where e.ErrorFlag = 1
If you can understand what these two scripts are doing, you should find numerous examples of where being able to generate additional values or additional rows of data would be very helpful.
To generate 1mln rows of report with the below mentioned script is taking almost 2 days so, really appreciate if somebody could help me with different script which the report can be generated within 10-15mins please.
The requirement of the report is as following;
Table “cover” contains 5mln rows & 6 columns of data and likewise table “data” contains 500,000 rows and 6 columns.
So, each numbers of the rows in table cover has to go through table date and provide the maximum matches.
For instance, as mentioned on the below tables, there could be 3 matches in row #1, 2 matches in row #2 and 5 matches in row #3 so the script has to select the max selection which is 5 in row #3.
Sample table
UPDATE public.cover_sheet AS fc
SET maxmatch = (SELECT MAX(tmp.mtch)
FROM (
SELECT (SELECT CASE WHEN fc.a=drwo.a THEN 1 ELSE 0 END) +
(SELECT CASE WHEN fc.b=drwo.b THEN 1 ELSE 0 END) +
(SELECT CASE WHEN fc.c=drwo.c THEN 1 ELSE 0 END) +
(SELECT CASE WHEN fc.d=drwo.d THEN 1 ELSE 0 END) +
(SELECT CASE WHEN fc.e=drwo.e THEN 1 ELSE 0 END) +
(SELECT CASE WHEN fc.f=drwo.f THEN 1 ELSE 0 END) AS mtch
FROM public.data AS drwo
) AS tmp)
WHERE fc.code>0;
SELECT *
FROM public.cover_sheet AS fc
WHERE fc.maxmatch>0;
As #a_horse_with_no_name mentioned in the comment to the question, your question is not clear...
Seems, you want to get the number of records which 6 fields from both tables are equal.
I'd suggest to:
reduce the number of select statements, then the speed of query execution will increase,
split your query into few smaller ones (good practice), to check your logic,
use join to get equal data, see: Visual Representation of SQL Joins
use subquery or cte to get result on which you'll be able to update table.
I think you want to get result as follow:
SELECT COUNT(*) mtch
FROM public.cover_sheet AS fc INNER JOIN public.data AS drwo ON
fc.a=drwo.a AND fc.b=drwo.b AND fc.c=drwo.c AND fc.d=drwo.d AND fc.e=drwo.e AND fc.f=drwo.f
If i'm not wrong and above query is correct, the time of execution of above query will reduce to about 1-2 minutes.
Finally, update query may look like:
WITH qry AS
(
-- proper select statement here
)
UPDATE public.cover_sheet AS fc
SET maxmatch = qry.<fieldname>
FROM qry
WHERE fc.code>0 AND fc.<key> = qry.<key>;
Note:
I do not see your data and i know nothing about its structure, relationships, etc. So, you have to change above query to your needs.
I have a very simple query that returns the Notes field. Since there can be multiple notes, I only want the top 2. No problem. However, I'm going to be using the sql within another query. I really don't want 2 lines in my results. I would like to combine the results into 1 field value so I only have 1 result line in the results. Is this possible?
For example, I currently get the following:
12345 1001 500.00 "Note 1"
12345 1001 500.00 "Note 2"
What I would like to see is this:
12345 1001 500.00 "Note 1 AND Note 2"
Following is the sql:
select top 2 rcai.field_value
from rnt_agrs ra
inner join rnt_agr_inv_notes rain on ra.rnt_agr_nbr=rain.rea_rnt_agr_nbr
inner join RNT_CUST_ADDNL_INFO rcai on rain.rea_rnt_agr_nbr=rcai.rea_rnt_agr_nbr and rain.bac_acc_id=rcai.bac_acct_id
where ra.rnt_agr_nbr=128260511
Thanks for your help. I appreciate this forum for help with these issues.....
Get the next row's value and filter all but the first row:
select ..., rcai.field_value || ' AND '
min(rcai.field_value) -- next row's value (same as LEAD in Standard SQL)
over (partition by ra.rnt_agr_nbr
order by rcai.field_value
rows between 1 following and 1 following) as next_field_value
from rnt_agrs ra
inner join rnt_agr_inv_notes rain on ra.rnt_agr_nbr=rain.rea_rnt_agr_nbr
inner join RNT_CUST_ADDNL_INFO rcai on rain.rea_rnt_agr_nbr=rcai.rea_rnt_agr_nbr and rain.bac_acc_id=rcai.bac_acct_id
where ra.rnt_agr_nbr=128260511
qualify
row_number() -- only the first row
over (partition by ra.rnt_agr_nbr
order by rcai.field_value) = 1
If there might be only a single row you need to add a COALESCE(min...,'') to get rid of the NULL.
Both OLAP functions specify the same PARTITION and ORDER, so this is a single working step.
select *,(SELECT top 2 rcai.field_value + ' AND ' AS [text()]
FROM RNT_CUST_ADDNL_INFO rcai
WHERE rcai.rea_rnt_agr_nbr = rain.rea_rnt_agr_nbr
AND rcai.bac_acct_id=rain.bac_acc_id
FOR XML PATH('')) AS Notes
from
rnt_agrs ra inner join rnt_agr_inv_notes rain
on ra.rnt_agr_nbr=rain.rea_rnt_agr_nbr
I had something like this, where there was a 1 to many, and I wanted a semicolon delimited set of values in a single column with the main record.
You could use PIVOT to transform the two note rows into two note columns based on row number, then concatenate them. Here's an example:
SELECT pvt.[1] + ' and ' + pvt.[2]
FROM
( --the selection of your table data, including a row-number column
SELECT Msg, ROW_NUMBER() OVER(ORDER BY Id)
--sample data shown here, but this would be your real table
FROM (VALUES(1, 'Note 1'), (2, 'Note 2'), (3, 'Note 3')) Note(Id, Msg)
) Data (Msg, Row)
PIVOT (MAX(Msg) FOR Row IN ([1], [2])) pvt
Note that MAX is used for the aggregate in the PIVOT since an aggregate is required, but since ROW_NUMBER is unique, you're only aggregating a single value.
This could also be easily extended to the first N rows - just include the row numbers you want in the pivot and combine them as desired in the select statement.
I have a set of Data in MS Access
Number Owner
1 Heelo
1 Hi
1 There
2 What
2 Up
This needs to be transferrid into
Number Owner1 Owner2 Owner3 Owner4
1 Heelo Hi There -
2 What Up - -
Any idea on how to go on with this?
The crux in this case is we don't have a third column from where we can pivot the data.
You could add a third column with a sequence of numbers:
SELECT Number, (select count(*)
from YourTable as s
where s.number = t.number) as sequence, owner
from YourTable as t
then apply this solution to the results: SQL to transpose row pairs to columns in MS ACCESS database
This question already exists:
Closed 10 years ago.
Possible Duplicate:
SQL Select DISTINCT using CAST
Let me try this one more time... I'm not a sql guy so please bear with me as I try to explain this... I have a table called t_recordkeepingleg with three columns of data. Column1 is named LEGTRIPNUMBER that happens to be a string that starts with the letter Q followed by 4 numbers. I need to strip off the Q and convert the remaining 4 characters (numbers) to an integer. Everyone with me so far? Column2 of this table is named LEGDATE. Column3 is named LEGGROUP.
Here's the input scenario
LEGTRIPNUMBER LEGDATE LEGGROUP
Q1001 08/12/12 0001
Q1001 09/15/12 0002
Q1002 09/01/12 0001
Q1002 09/08/12 0003
Q1002 09/09/12 0002
As you can see the input table has rows where LEGTRIPNUMBER occurs more than once. I only want the first occurrence.
This is my current select statement - it works but returns all rows.
SELECT *,
CAST(
substring("t_RecordkeepingLeg"."LEGTRIPNUMBER",2,4) as INT
) as Num_Trip_Num
FROM "1669"."dbo"."t_RecordkeepingLeg" "t_RecordkeepingLeg"
Where left "t_RecordkeepingLeg"."LEGTRIPNUMBER",1) = 'Q'
I want to modify this so that it only selects ONE occurance of the Qnnnn. When the row gets selected I want to have LEGDATE and LEGGROUP available to me. How do I do this?
Thank you,
Can it be as simple as below? I've just added condiotion on leggroup being 0001
SELECT *,
CAST(substring("t_RecordkeepingLeg"."LEGTRIPNUMBER",2,4) as INT) as Num_Trip_Num
FROM "1669"."dbo"."t_RecordkeepingLeg" "t_RecordkeepingLeg"
Where left ("t_RecordkeepingLeg"."LEGTRIPNUMBER",1) = 'Q'
and "t_RecordkeepingLeg"."LEGGROUP"='0001'
If you have a unique primay key in your table you can do something like the below;
SELECT CAST(
substring("t_RecordkeepingLeg"."LEGTRIPNUMBER",2,4) as INT
) as Num_Trip_Num
FROM "1669"."dbo"."t_RecordkeepingLeg" "t_RecordkeepingLeg"
Where "t_RecordkeepingLeg"."ID" In(
Select Min("t_RecordkeepingLeg"."ID")
From "1669"."dbo"."t_RecordkeepingLeg" "t_RecordkeepingLeg"
Where left ("t_RecordkeepingLeg"."LEGTRIPNUMBER",1) = 'Q'
Group By "t_RecordkeepingLeg"."LEGTRIPNUMBER"
)
Which values of LEGDATE & LEGGROUP do you want for the distinct LEGTRIPNUMBER? there are multiple non-distinct possibilities and the concept of "first occurrence" is only valid with an explicit order.
To get the values where LEGDATE is the earliest for example;
select Num_Trip_Num, LEGDATE, LEGGROUP from (
select
cast(substring(t_RecordkeepingLeg.LEGTRIPNUMBER, 2, 4) as INT) as Num_Trip_Num,
row_number() over (partition by substring(t_RecordkeepingLeg.LEGTRIPNUMBER, 2, 4) order by t_RecordkeepingLeg.LEGDATE asc) as row,
t_RecordkeepingLeg.LEGDATE,
t_RecordkeepingLeg.LEGGROUP
from t_RecordkeepingLeg
where left (t_RecordkeepingLeg.LEGTRIPNUMBER, 1) = 'Q'
) T
where row = 1