I work with MS Access 07 and need a little help.
I have two tables TbProjectTeam and TbProjectList. I need to compare date of employee turn-out and date of project start. I used that SQL syntax:
SELECT [TbProjectTeam ].[Surname, name]
FROM TbProjectTeam
INNER JOIN TbProjectList
ON TbProjectTeam .[DateofTurnOut] <= TbProjectList.[DateOfStart]
WHERE TbProjectList.[ID] = 1
ORDER BY [Surname, name];
My aim is to replace 1 in TbSeznamUkolu.[ID] = 1 expression with something as ROW_NUMBER() OVER in SQL. MS Access doesn't support this function but unfortunately I need to know row index of all projects. I imagine that will be displayed matching employees for every row.
Can anyone help me please? Big thanks.
MS Access has an AutoNumber data type that sets sequential numbers on records. Your data set would need to include an AutoNumber field to represent the ROW in T-SQL. Since the AutoNumber is numeric you could do > and < functions on it.
The only problem with this is that the records will be numbered sequentially as they are added to the table. If you can control the sequence in which they are added then there is no problem, but if you were to add the AutoNumber field to an existing populated table, the sequence may not match your requirements.
I realise this question is a bit old but I hope this helps.
DCOUNT function in spite of the efficiency issue provides a similar effect:
Just answered a similar answer here: How to show the record number in a MS Access report table?.
Related
How to select only specific number of columns from a table in hive. For Example, If I have Table with 50 Columns, then how Can I just select first 25 columns ? Is there any easy way to do it rather than hard coading the column names.
I guess that you're asking about using the order in which you defined your columns in your CREATE TABLE statement. No, that's not possible in Hive for the moment.
You could do the trick by adding a new column COLUMN_NUMBER and use that in your WHERE statements, but in that case I would really think twice of the trade off between spending some more time typing your queries and messing your whole table design by adding unnecessary columns. Apart from the fact that if you need to change your table schema in the future (for instance, by adding a new column), adapting your previous code with different column numbers would be painful.
I have an order table in sql server and I need for the order number primary key to be like this
OR\20160202\01
OR is just a string
20160202 is the Date
01 is sequence number for that day
for second Order record the same day it would be
OR\20160202\02 and so on..
backlashes should also be included...
Whats the way to go about creating such a field in sql server (using version 2016)
EDIT: to add more context to what sequence number is, its just a way for this field composite or not to be unique. without a sequence number i would get duplicate records in DB because i could have many records the same day so date would remain the same thus it would be something like
OR\20160202 for all rows for that particular day so it would be duplicate. Adding a "sequence" number helps solve this.
The best way is to not create such a column in SQL. You're effectively combining multiple pieces of data into the same column, which shouldn't happen in a relational database for many reasons. A column should hold one piece of data.
Instead, create a composite primary key across all of the necessary columns.
composite pk
order varchar(20)
orDate DateTime
select *
, row_number() over (partition by cast(orDate as Date) order by orDate) as seq
from table
Will leave it to you on how to concatenate the data
That is presentation thing - don't make it a problem for the PK
About "sequence number for that day" (department, year, country, ...).
Almost every time I discussed such a requirement with end users it turned out to be just misunderstanding of how shared database works, a vague attempt to repeat old (separate databases, EXCEL files or even paper work) tricks on shared database.
So i second Tom H and others, first try not to do it.
If nevertheless you must do it, for legal or other unnegotiatable reasons then i hope you are on 2012+. Create SEQUENCE for every day.
Formatted PK is not a good idea.Composite key is a better approach.The combination of day as a date column and order number as a bigint column should be used.This helps in improving the query performance too.
You might want to explore 'Date Dimension' table. Date Dimension is commonly used table in data warehousing. It stores all the days of the calendar(based on your choice of years) and numeric generated keys for these days. Check this post on date dimension. It talks about creating one in SQL SERVER.
https://www.mssqltips.com/sqlservertip/4054/creating-a-date-dimension-or-calendar-table-in-sql-server/
I was practicing a subqueries in sql and all of a sudden i jumped into an unsual query which i never thought of could happen.
The question of my query is....
Write a query to display the average rate of Australian dollar,where the currency rate date is July 1 2005??
And the query was...
USE AdventureWorks2012
SELECT AverageRate FROM Sales.CurrencyRate
WHERE ToCurrencyCode='AUD' AND CurrencyRateDate IN
(SELECT CurrencyRateDate FROM Sales.Currency
WHERE CurrencyRateDate='2005-07-01')
So,my question is how is it possible to get the column name "CurrencyRateDate" in the sub query when it is actually from the table "CurrencyRate"??
I know my query is not in the correct format as it should be.
I'm extremely sorry if my title doesn't make sense.If you guys can give any better please change it..
Thanks
AND CurrencyRateDate IN
(SELECT CurrencyRateDate FROM Sales.Currency
WHERE CurrencyRateDate='2005-07-01')
All the CurrencyRateDate references here point to the column from the outer query.
So for each row in the outer query, you are getting a list consisting of only that row's CurrencyRateDate, repeated once for every row in the Sales.Currency table (if the CurrencyRateDate of that row is 2005-07-01, otherwise the list is empty).
Then you check whether the outer CurrencyRateDate value is in that list. Which it is, if and only if it's equal to 2005-07-01 (assuming there is at least one row in Sales.Currency).
So your query is equivalent to:
SELECT * FROM Sales.CurrencyRate
WHERE ToCurrencyCode='AUD' AND CurrencyRateDate='2005-07-01'
I need your assistance to figure out how to achieve the following in MS access database.
I have a table with a lot of columns but one of them has a numeric value that will be used as how many times will the record will be repeated.
I need to make another table with repeated records based on Count column.
Build a numbers (aka tally) table (you can google it). I'll call it tblNumbers. Then all you need to do is create a query SELECT <yourTable>.* FROM <yourTable>, tblNumbers WHERE tblNumbers.Number <= <yourTable>.<numberField>
I am working on a project in ACCESS 2010 that requires me to give a rank to 30000 products based on their sales. I have tried using a query to do the ranking and it takes a long time. (Please find codes at Making the ranking query efficient)
I figured out that instead, I can just sort the table based on the Sales column and add a field with numbers 1 to 30000.
So is there a way to add such a column, i.e. a column without any relationship to the existing table.
Add a field to the actual table? If that's the case, make a table and run this query:
ALTER TABLE yourTableName
ADD COLUMN yourColumnName AUTOINCREMENT(1, 1)