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I would like to know if there is any problem or any sort of combinations that can not be solved using SQL language.
Is there any list in the web where I can find situations that are impossible to measure using SQL?
Or is everything possible to calculate using SQL.
Thank you.
SQL is pretty flexible, but it can't do everything. However there is no handy guide that I know of that lists what it can't do. There are things that I think you can do but shouldn't: anything that involves doing calculations one row at a time are very inefficient and will generally be faster if done in code.
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I've always struggled with how to format SQL queries in terms of whitespace, alignment, etc. It seems whenever there is an "auto-formatter" it seems to format things differently than the next one, whether it is within a SQL client or a website or text-editor that does various language formatting. Are there any guideline(s) for how SQL should be formatted for best readability? Here is an example of how I currently do it:
SELECT
name
FROM
sales_instance si
JOIN main_iteminstance i ON si.instance_id=i.id
ORDER BY
name
Also, yes I know this may be 'opinion-based' and people may want to close it for that, but I think this answer is helpful as to writing clean SQL and hopefully someone can provide a good summary of the available formats or guidelines.
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I am curious if one can see the internal mechanism of merge join or any other join sql?
For Oracle have a look at this document: Database SQL Tuning Guide - Joins
If you are thinking about how they work, you can look it up here, it's a great representation of it.
If you are thinking about the code behind it, I think you'll have to work for MS to access it ;)
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Can anyone articulate what the key differences are between SAS and SQL? I haven't worked much with SAS but went on a weeks training course, and basically it seemed like the equivalent but more convoluted and was able to do graphs.
Would appreciate some key bullet differences between them.
Standard SQL is a language to query, manipulate and define data in any(!) database. It is like the "latin language" of DB systems. Everyone knows it in order to perform standard tasks. SAS is like an extension to that with many functions.
I found a good document:
http://www.sascommunity.org/mwiki/images/5/52/CMSSUG-0506-SQL.pdf
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I have a very big excel sheet that holds many information such as dates, item number, description, etc. I am trying to filter out a few things with if statements but i am like filtering around 10 or more things, the only way i know how to go about doing this is many IF statements together:
IF(statement>value,IF(statement>value,IF............))) as an example
is there an easier and simple way of doing this? all these nested IF statements are hard to keep up and hard on the eyes after a while, also i would like to have the sum of the numbers after it goes pass these fitlers. please help
To get the proper format for a SUM formula with 3 conditional IF statements. Is it this?
=SUM(IF($A$1:$A$20=A25,IF($B$1:$B$20=B25,IF($C$1:$C$20=C25))),$D$1:$D$20)
Your can try this code:
=IF(SUM($A$1:$A$20)=A25,IF(SUM($B$1:$B$20)=B25,IF(SUM($C$1:$C$20)=C25,SUM($D$1:$D$20),0),0),0)
NESTED IF
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i'm wanting to write data into memory only for a temp time. the format is essentially the same as an sql table with say 5 columns and 1,000 rows, give or take. simply i want to store this data and run queries against it to make calculations, sorting it, querying it to then produce chart reports and excel data.
I looked at custom psobjects and then sql and i can't see why i'd use custom psobjects over sql, what do you think?
I also couldn't see that adding multiple rows as such, using psobjects was as straight forward as adding another row in sql.
thanks
steve
I guess it depends on what you're more comfortable with, but if you're going to do it in Powershell then using PS custom objects seems like a logical choice since the cmdlets were designed to work with those.