I have two different query on hand (columns are not alike). First I want to delete the records in certain columns in the target table with a specific criteria, and then insert the data from the source table.
but the thing is; there might be a case where I have two rows in the source table, where the associated records are only one row in the target table. Is it possible to set a 1.delete/2.insert into query for this case?
I tried to use an update query, but it wouldnt work since I try to change the record for certain columns and the two tables are not alike
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I'm using multiple Calc tables in a single document for ingoing and outgoing bills that are stored in a SQL DB. Table A has ingoing bills and Table B has outgoing bills. For example table A has data from B2-B39 and table B has data from B2-B15. I need the sum function to automatically adjust when data entries are added or subtracted.
I can use =SUM(B2:B39) in tableA.B40 and =SUM(B2:B15) in tableB.B16 to get the sums of the current data, at the end of the data entries. However, when the DB changes, for example Table A has data from B2-B44, I end up missing five entries. To further complicate things, I have Table C, where I evaluate the net income. For example in Table C I use tableB.B16-tableA.B40. When the number of entries in tables A and B change the function in Table C no longer works.
I need SUM in multiple tables to automatically adjust its position based on how many rows of data are found in the DB.
Maybe there is something about your layout that you have not mentioned but a solution would seem to be to apply whole column references (eg =SUM(B:B)), or if you must have the total in the same column move it to the top and sum like so:
=SUM(B2:B1048576)
Otherwise try something like LibreOffice Basic and search for the first empty cell in the column to put the formula in.
I have a table traffic with 7 columns, namely toll_id, date1, shift, car_single, car_return, car_local and car_total.
How could I populate first 5 columns manually, and then store a value in column car_total, which will be the sum of car_single and car_return?
Here is the image of my table:
Just to add a 3rd and 4th ways of achieving the desired outcome:
If you have at least MySQL v5.7.6, you can use a generated column as car_total.
Alternatively, you can choose not to store car_total at all, but calculate this value on the fly while querying the table.
Having a column to store the results of the calculation is good if you regularly have search based on that field because you can use indexes to speed up the searches. Calculating the results on the fly may be better, if you just need to display the result of the calculation, but there is no need to filter on it.
There are two ways to do this:
Add the logic in the application itself, so that it calculates total before inserting the record. (Recommended)
Write an after insert trigger (http://dev.mysql.com/doc/refman/5.7/en/trigger-syntax.html) which calculates the count when record is inserted.
I am curious if it is possible to limit the results of an sql select statement by joining another table with selectable options. ie. Have one table that a user can use to update their preferences such as display a,c,d and do not display b and e. (assuming the table would only have columns a-e) (this has is separate from the question). Once the user has updated / selected their options im curious if i can create an sql select statement that would fetch the results of another table based off of the options selected by the user in the first table. I know can can create a larger statement that would include all of the results and omit them if the value is not provided. im curious if there is a way to only select particular columns based off of another table
im curious if there is a way to only select particular columns based
off of another table
No. Queries cannot have varying columns. Technically, you can make a stored procedure do something like that; but it is considered a rather poor practice.
...and doing it the right way is likely not going to be a "larger statement".
I have a series of tables in an Access 2007 database. I am trying to find a way of outputting a flat-file to an excel spreadsheet that combines all of the tables so that each row of the flatfile represents a unique combination of the table rows from each table.
For example, these tables:
Would combine to make this output table:
The challenges I'm facing are:
The 'input' tables can vary in number of rows and columns, as well as quantity
The total number of rows in the final output table can get quite large (200,000+ rows)
I know Excel and VBA (in Excel) well but almost nothing about Access
Is there a way to do this in Access? Is there some native functionality in Access that I'm completely overlooking? Any pointers (even if it's "you need to read into X and Y") would be greatly appreciated!
Thanks,
Adam
As noted above:
Create a new query. Select your 3 tables as the data sources. If desired, set up joins between tables by dragging a line between a field in one table to a field in another. Without joins you will get a Cartesian Product ... every from 1st table paired with every row of 2nd table, and then each of those combination paired with every row of 3rd table. Select the fields you want included in the result set. When the query returns what you need, save it and give it a name. Then you can export that named query to Excel.
If the table is large, you could hit Excel's row / column limit though.
I am trying to develop a report having two tables with one single data set.each table is filtered with the user giving a date parameter. is there any way that I can get the value present in a text of table1 into the table 2.
If you have a report with two table objects in it, both of which point at the same dataset, then all of the data in either table will be available in the other table - the only reason that one value would be available in one table but not the other is if the tables have different filter conditions. Therefore, you may need to amend the filter conditions.