In my universe, apart from all other tables, there are 2 tables to which my question refers: 'Contract' and 'Address'.
They are connected with 0,1 (Contract) to 1,n (Address) connection.
If in the Launchpad I select all attributes from both tables and press on 'Regenerate', I get no rows as a result. The question is why is this happening when I have clearly defined OUTER JOIN on Contract tables between these two tables.
However, when I analyse the generated query and when I run that query in database tool, I get 13,5 million rows. This result was even more surprising. Can anybody please explain why?
Finally, when inside the Launchpad I click not on 'Regenarate' button, but on 'Start the Query' button, I get the following message: "No data available" (translation from German).
And this totally confused me.
My first thought was that maybe because of the large dataset (13,5 million rows) Launchpad denied to run the query. However, that does not explain why I got no rows when I clicked on 'Regenarate' button, because in that case I would have to get only 5000 rows as data preview.
Looking forward to your suggestions.
Related
In order to export data through my web hosting service's SQL interface, I have to first run a SELECT call on the table and then click an "export" button at the bottom of the output. The problem is that I am sometimes trying to export hundreds of thousands of rows, and my browser crashes trying to display them all.
Is there a way to limit the number of rows displayed from a SQL call without limiting the rows actually selected? I know that it's possible to export the data directly through the SQL call, but that's pretty far above my pay grade (I tried doing it but I'm getting an access denied error, and I'd like to avoid having to figure that out if I can). I'm pretty new to SQL, so this might be a dumb question (like, I could imagine the number of rows displayed being entirely a property of the interface, not SQL itself) -- but I figured I'd ask anyway :)
I have a db of some 20k error code entries, and i would like to generate a report that show
how many of each is stored.
The user creates a entry when working on a specific error and they get it from another table
example
I tried creating Queries with the selected data for the report and then using the report wizard to help.
but the SUM function add's the codes together, and the count records counts ALL together.
I am looking to create a report that i group by "Area" which is working fine.
and under each area i den count "example from the screenshot" like this
Error: - >
Do you have any idea's or is there report software that can help me achieve this?
EDIT:
One solution is i found is -
https://support.microsoft.com/en-us/office/count-data-by-using-a-query-b84cdfd8-07ba-49a7-b067-e1024ccfcca8
Count records in a group or category
But then the problem is i am missing a column with the actual reference of the AlarmNo because now i am counting them, and i am still insterested in getting the Original number.
AlarmNo - Count of these.
Sorry i cannot share data or tables not my data.
Allright i found out what i was doing wrong, it was my sql query.
I changed the queries for each area like this.
This one for England, and it now works when i generate a report.
What i was missing was the "Count" AS CountOfAlarmCode.
Thank you for looking anyway.
´´SELECT Data2020.[Country], Data2020.[Site], Data2020.[AlarmCode], Count(Data2020.AlarmCode) AS CountOfAlarmCode, Data2020.[AlarmText]
FROM Data2020
GROUP BY Data2020.[Country], Data2020.[Site], Data2020.[AlarmCode], Data2020.[AlarmText]
HAVING (((Data2020.[Country])="England"));´´
I am loading a very big testing database into MYSQL (I have a script running to load all the tables). I think the loading process is going to take a few days so I am trying to determine which tables have been completely loaded and also make sure every tuple is correctly stored. I have many tables so I do not want to do a count for each table one by one; I was wondering if there is a function to display all the tables in my database with a summary of the information about them (ie number of rows). So far,I have found the function SHOW TABLES but this does not show any information about the tables.
Please let me know if there is a way to obtain this information without having to run queries for every table.
Thanks
Some background information:
I have one database online, and the other is hosted locally.
Each database has a table of products with ID's that correspond to each other. For the sake of the example they can both be called product_id
The local database has a checkbox that says "on internet", the field is just called OnInternet.
The situation. I'm trying to run a query that will list all product_id's where OnInternet is "no"
When I try to run the query, it just shows the same product.
What am I doing wrong?
I am trying to determine the best method of collecting a large list from a database and then displaying and filtering the results on the client side. Let me give a quick example:
Example: I've got a database with customer data and currently it contains around 2000 records. This number is constantly increasing. On my website I have a page that I want to be able to query said database based on information such as name, email, phone number etc. and of course display the results (when a user types in Smith it returns all records containing the name Smith). I am planning on using AJAX so that I can query the database and display the results on the fly similar to how google does it. When a user begins searching, results will start showing up on the page as they are found.
Possible Solutions:
Unfortunately I am stumped on how to go about implementing something like this. I am considering using a ValueList pattern. When the user first loads the page, should I be querying the database and storing every record in a collection and then searching that collection list and displaying the results on my jsp page? Essentially creating a java database. The thing I like about the ValueList pattern is that I take one huge hit on page load and dump the entire database in objects stored in a list. What if the database is larger though, say 2,000,000 records?
Or should I be using a simple DOA pattern without the ValueList and query the database for each individual search? This would result in a LOT of database queries, especially considering that I plan on returning results as the user types in the search box.
Edit: The more I think about this, the more it is an AJAX question. My biggest concern should be how to query my database while the user is typing. Do I set some sort of listener to listen for the user to stop typing and then perform the query?
I would use Solr for this type of task.
Fields, which you are going to use for searching should be indexed with Solr.
Then you do an ajax query to Solr and get the result. You can set the order, number of items per page and show results only for current page.
Solr has a lot of other features that can be useful for you.