A little background:
I have two tables imported from excel. One is 300k + rows so when I do updates to it in excel it just runs too slow, and often doesn't process on my comp. Anyways, I used a 'outer' left join to bring the two together.
Now when I run the query, I get the result which works fine but I need to add some fields to these results.
I am hoping to mimic what Ive done in excel, so I can create my summary pivots in the same manner.
First, I need a field that just concatenates two others after the join.
Then I need to add a field the equivalent of:
1/Countif($T$2:$T$3330,T2) from excel to access. However, the range does not need to be fixed. I will get it so that all the text entries are at the top of the field, so in theory, i need the equivalent of Sheets("").Range("T2").End(xldown). This proportion is used to eliminate double counting when i do pivot tables.
I am probably making this much more complicated than it has to be but I am new to Access as well, so please try to explain some things in explanations.
Thanks
Edit: I currently have:
Select [Table1].*, [Table2].PlaySk, [Table2].Service
From [Table1] Left Join [Table2] On [Table1].Play + [Table1].Skill
= [Table2].PlaySk
And in a general case, what I am trying to solve is something to get ColAB and ColProportion.
ColA ColB ColAB ColProportion
a 1 a1 .5
b 1 b1 1
a 1 a1 .5
b 2 b2 .3333333
b 2 b2 .3333333
b 2 b2 .3333333
Sounds to me like you'll need to make a couple queries in sequence to do everything you need.
The first part (concatenate) is relatively easy though -- just take the two field names you wish to concatenate together, say [Play] and [Skill], and, in design view, make a new field like "PlaySk: [Play] & [Skill]".
If you want to put a character between them (I often do when I concatenate, just to keep things straight), like a semicolon for example, you can do "PlaySk: [Play] & ';' & [Skill]".
As for the second part, I think you'll want to build a "Group By" query on top of the other one. In your original query, make another field in design view like this: "T2_Counter: Iif([The field you're checking, i.e. whatever column T is] = 'whatever value you're checking for, i.e. whatever T2 is',1,0)". This will result in a column that's a 1 when the check is true, and a zero otherwise.
Then bring this query into a new one, click "Totals" at the top in the Design tab, then bring the fields you want to group by down. Then create a field in design view like this: "MagicField: 1/Sum(T2_Counter)".
Hopefully this helps get you started at least.
Related
Can I select a column based on another column's value being listed as a formula? So I have a table, something like:
column_name formula val
one NULL 1
two NULL 2
three one + two NULL
And I want to do
SELECT
column_name,
CASE WHEN formula IS NULL
val
ELSE
(Here's where I'm confused - How do I evaluate the formula?)
END as result
FROM
table
And end up with a result set like
column_name result
one 1
two 2
three 3
You keep saying column, and column name, but you're actually talking about rows, not columns.
The problem is that you (potentially) want different formulas for each row. For example, row 4 might be (two - one) = 1 or even (three + one) = 4, where you'd have to calculate row three before you could do row 4. This means that a simple select query that parses the formulas is going to be very hard to do, and it would have to be able to handle each type of formula, and even then if the formulas reference other formulas that only makes it harder.
If you have to be able to handle functions like (two + one) * five = 15 and two + one * five = 7, then you'd be basically re-implementing a full blown eval function. You might be better to return the SQL table to another language that has eval functions built in, or you could use something like SQL Eval.net if it has to be in SQL.
Either way, though, you've still got to change "two + one" to "2 + 1" before you can do the eval with it. Because these values are in other rows, you can't see those values in the row you're looking at. To get the value for "one" you have to do something like
Select val from table where column_name = 'one'
And even then if the val is null, that means it hasn't been calculated yet, and you have to come back and try again later.
If I had to do something like this, I would create a temporary table, and load the basic table into it. Then, I'd iterate over the rows with null values, trying to replace column names with the literal values. I'd run the eval over any formulas that had no symbols anymore, setting the val for those rows. If there were still rows with no val (ie they were waiting for another row to be done first), I'd go back and iterate again. At the end, you should have a val for every row, at which point it is a simple query to get your results.
Possible solution would be like this kind....but since you mentioned very few things so this works on your above condition, not sure for anything else.
GO
SELECT
t1.column_name,
CASE WHEN t1.formula IS NULL
t1.val
ELSE
(select sum(t2.val) from table as t2 where t2.formula is not null)
END as result
FROM
table as t1
GO
If this is not working feel free to discuss it further.
I have a list of 2500 obj numbers stored in Excel for which I need to run the below SQL:
SELECT
a.objno,
a.table_comment,
b.queue_comment
FROM
aq$_queue_tables a
JOIN
AQ$_QUEUES b ON a.objno = b.table_objno
WHERE
a.objno = 19551;
Is there any way I can write a loop on above SQL with objno feeding from a list or from a different table? I also want to store/produce all the results from each loop run as a single output.
I considered the option to upload the numbers into a new table and add a where condition:
a.objno=(SELECT newtab.objectno FROM newtab);
However, the logic I'll be writing in the query would exclude certain objectno results. Let's say that the associated objectno has certain queue_comment as of certain date associated with that objectno. I do not want to pull that record. This condition would match with some objectno and wouldn't match with others. Having that condition and running the query against all the objectno is returning 0 results. I couldn't share the original logic as it would reveal certain business rules and it'll be a violation of some policy.
So, I need to run the query on each objectno separately and combine the results.
I'm totally new to SQL and got this task assigned. I'm aware of the regular loop, for in SQL, but I don't think I can apply them in this situation.
Any guidance or reference links to helpful topics is much appreciated as well.
Thanks in advance for the help.
One option is to upload the object numbers from Excel sheet to a table in the database and run the query as following. Assuming newtab is the table where the objectno are uploaded.
SELECT
a.objno,
a.table_comment,
b.queue_comment
FROM
aq$_queue_tables a JOIN AQ$_QUEUES b on a.objno = b.table_objno
WHERE
a.objno IN (SELECT newtab.objectno FROM newtab);
I have used a subquery here, join to the aq$ can work as well.
Reading the comments and all I think you need to enhance your Excel with 2 additional columns and load to a new table.
IN can be used in the following way too:
SELECT
a.objno,
a.table_comment,
b.queue_comment
FROM
aq$_queue_tables a
JOIN
AQ$_QUEUES b ON a.objno = b.table_objno
WHERE
(a.objno,a.table_comment,b.queue_comment) IN (19551,'something','something');
so with the new table will be:
WHERE
(a.objno,a.table_comment,b.queue_comment) IN
(select n.objno, n.table_comment, n.queue_comment from new_table n)
I have the following data in excel sheet A.
Category Name
Fruit Apple
Vegetable Brinjal
XYZ Abc
I want to create a formula which takes a value for name column, outputs the corresponding category column.
If I use VLookUp, I have to copy this reference table in each and every excel sheet wherever I need to have this operation.
Hence I am looking for something similar to
IF(input="Apple","Fruit",IF(input="Brinjal","Vegetable",IF(input="Abc",XYZ,"")))
But There is limit on nested ifs in excel and no of cases that we can have in a switch case are also limited.
I have around 200 rows of this table.
use INDEX and MATCH functions. INDEX on "category" by matching "name"
You certainly don't need so many IF statements (though I note your Q Title), for example:
=CHOOSE(MATCH(D13,{"Apple","Brinjal","Abc"},0),"Fruit","Vegetable","XYZ")
which should not grow at quite the rate your version would - but with 200 'pairs' would be getting close to the limit for CHOOSE.
(D13 as example in spreadsheet.)
I am stumped on how to make this query run more efficiently/correctly. Here is the query first and then I can describe the tables that are involved:
UPDATE agg_pivot_test AS p
LEFT JOIN jd_cleaning AS c
ON c.Formerly = IIF(c.Formerly LIKE '*or*', '*' & p.LyFinalCode & '*', CStr(p.LyFinalCode))
SET p.CyFinalCode = c.FinalCode
WHERE p.CyFinalCode IS NULL AND c.Formerly IS NOT NULL;
agg_pivot_test has 200 rows of data and only 99 fit the criteria of WHERE p.CyFinalCode IS NULL. The JOIN needs some explaining. It is an IIF because some genius decided to link last year's data to this year's data using Formerly. It is a string because sometimes multiple items have been consolidated down to one so they use "or" (e.g., 632 or 631 or 630). So if I want to match this year's data I have to use Formerly to match last year's LyFinalCode. So this year the code might be 629, but I have to use the Formerly to map the items that were 632, 631, or 630 to the new code. Make sense? That is why the ON has an IIF. Also, Formerly is a string and LyFinalCode is an integer... fun.
Anyway, when you run the query it says it is updating 1807 records when again, there are only 200 records and only 99 that fit the criteria.
Any suggestions about what this is happening or how to fix it?
An interesting problem. I don't think I've ever come across something quite like this before.
I'm guessing what's happening is that rows where CyFinalCode is null, are being matched multiple times by the join statement, and thus the join expression is calculating a cartesian product of row-matches, and this is the basis of the rows updated message. It seems odd, as I would have expected access to complain about multiple row matches, when row matches should only be 1:1 in an update statement.
I would suggest rewriting the query (with this join) as a select statement, and seeing what the query gives you in the way of output; Something like:
SELECT p.*, c.*
FROM agg_pivot_test p LEFT JOIN jd_cleaning c
ON c.Formerly = IIF(c.Formerly LIKE '*or*', '*' & p.LyFinalCode & '*', CStr(p.LyFinalCode))
WHERE p.CyFinalCode IS NULL AND c.Formerly IS NOT NULL
I'm also inclined to suggest changing "... & p.LyFinalCode & ..." to "... & CStr(p.LyFinalCode) & ..." - though I can't really see why it should make a difference.
The only other thing I can think to suggest is change the join a bit: (this isnt guaranteed to be better necessarily - though it might be)
UPDATE agg_pivot_test AS p LEFT JOIN jd_cleaning AS c
ON (c.Formerly = CStr(p.LyFinalCode) OR InStr(c.Formerly, CStr(p.LyFinalCode)) > 0)
(Given the syntax of your statement, I assume this sql is running within access via ODBC; in which case this should be fine. If I'm wrong the sql is running server side, you'll need to change InStr to SubString.)
I've got to write 50 relatively simple queries, that all use the same basic form, but each successive query depends on the one before it to run.
I can quick and easily write the queries in SQL in an text editor e.g. word, but I dont know how to import the text back into access. Nor do I know how to specify the name of the query in the SQL code or how to specify that the end of a query has been readched.
Here is a sample of 4 queries. Here, the 1st line is the name of the Query and the two consecutive hard return represents the end of eqch query.
‘Ring2Q1
SELECT RINGS.Parent, RINGS_1.Child, 2 AS Ring
FROM RINGS INNER JOIN RINGS AS RINGS_1 ON RINGS.Child = RINGS_1.Parent;
‘Ring2Q2
SELECT Ring2Q1.Parent, Ring2Q1.Child, Max(Ring2Q1.Ring) AS Ring
FROM Ring2Q1
GROUP BY Ring2Q1.Parent, Ring2Q1.Child;
‘Ring3Q1
SELECT RINGS.Parent, Ring2Q2.Child, 3 AS Ring
FROM RINGS INNER JOIN Ring2Q2 ON RINGS.Child = Ring2Q2.Parent;
‘Ring3Q2
SELECT Ring3Q1.Parent, Ring3Q1.Child, Max(Ring3Q1.Ring) AS Ring
FROM Ring3Q1
GROUP BY Ring3Q1.Parent, Ring3Q1.Child;
Go into Access. Create a new query. Select SQL View. You can copy and paste the text of the query in here. Save it as the name you need for the next query. Repeat. You will obviously need a starting table that the first query calls. I would look at why you need a cascading set of 50 queries, on any sizeable amount of data this is going to take a long time to run.