Hi I have a table which was designed by a lazy developer who did not created it in 3rd normal form. He saved the arrays in the table instead of using MM relation . And the application is running so I can not change the database schema.
I need to query the table like this:
SELECT * FROM myTable
WHERE usergroup = 20
where usergroup field contains data like this : 17,19,20 or it could be also only 20 or only 19.
I could search with like:
SELECT * FROM myTable
WHERE usergroup LIKE 20
but in this case it would match also for field which contain 200 e.g.
Anybody any idea?
thanx
Fix the bad database design.
A short-term fix is to add a related table for the correct structure. Add a trigger to parse the info in the old field to the related table on insert and update. Then write a script to [parse out existing data. Now you can porperly query but you haven't broken any of the old code. THen you can search for the old code and fix. Once you have done that then just change how code is inserted or udated inthe orginal table to add the new table and drop the old column.
Write a table-valued user-defined function (UDF in SQL Server, I am sure it will have a different name in other RDBMS) to parse the values of the column containing the list which is stored as a string. For each item in the comma-delimited list, your function should return a row in the table result. When you are using a query like this, query against the results returned from the UDF.
Write a function to convert a comma delimited list to a table. Should be pretty simple. Then you can use IN().
Related
We have a legacy vb6 solution working with an access database with one of the forms containing a number of mutually exclusive option buttons
There is no reference table and the options are saved/loaded using hard coding ie. values in the field optState would be either 0, 1 or 2.
We are building a query in Access to export data into XML and looking for a way to convert the options into text fields without updating the DB or VB application!. So if 0 show some text, 1 some other text ... etc.
Is there a way we can do this in the access query or access sql?
No plans to upgrade the VB or DB so looking for a workaround.
thanks
jay
You could use IIf (Immediate If) to do this in a query. As you have multiple values per field, you would need to nest them. Something like:
SELECT tblStatus.*,
IIf([Status]=0,"Available",IIf([Status]=1,"Sold",IIf([Status]=2,"Withdrawn",""))) AS StatusOut
FROM tblStatus;
This returns an empty string if a value is not 0/1/2. Or you could use Switch in the query:
SELECT tblStatus.*,
Switch([Status]=0,"Available",[Status]=1,"Sold",[Status]=2,"Withdrawn") AS StatusOut
FROM tblStatus;
Regards,
I have a database. I created it with HeidiSQL. Its look like this.
I enter the value-1 and value-2.
Is there a way to enter a formula to Result column like " =Value-1 * Value-2 " ? I want my database to calculate the Result when I enter my values to other cells.
A trigger is one way to achieve automated column content.
A second one is a view, which you can create additionally to the table. That view could contain SQL which generates the result:
SELECT value1, value2, value1*value2 AS result
A third (more modern) alternative is adding a virtual column in your existing table. You can do that with HeidiSQL's table editor, like shown in the screenshot. Just add a new column with INT data type, and set its Virtuality to "VIRTUAL", and Expression to "value-1 * value-2". That's it.
I'm not familiar with HeidiSQL, but it appears to be a front end? What RDBMS are you using, for example SQL Server allows a computed column.
SQL
ALTER TABLE YourTable
ADD Result AS ([Value-1] * [Value-2])
Right click your database name in the folder structure, go to --> create new then -->Trigger
Then you can create a trigger that when entering data, will be activated on the entire column like this:
But you will need to know how to write the actual query and function. This requires basic knowledge that is generally generic and consistent of most all SQL languages.
I accidentally added a wrong column to my BigQuery table schema.
Instead of reloading the complete table (million of rows), I would like to know if the following is possible:
remove bad rows (rows with values contains the wrong column) by running a "select *" query on the table with some kind of filter, and saving result to same table.
removing the (now) unused column.
Is this functionality (or similar) supported?
Possibly the "save result to table" functionality can have a "compact schema" option.
The smallest time-saving way to remove a column from Big Query according to the documentation.
ALTER TABLE [table_name] DROP COLUMN IF EXISTS [column_name]
If your table does not consist of record/repeated type fields - your simple option is:
Select valid columns while filtering out bad records into new temp table
SELECT < list of original columns >
FROM YourTable
WHERE < filter to remove bad entries here >
Write above to temp table - YourTable_Temp
Make a backup copy of "broken" table - YourTable_Backup
Delete YourTable
Copy YourTable_Temp to YourTable
Check if all looks as expected and if so - get rid of temp and backup tables
Please note: the cost of above #1 is exactly the same as action in first bullet in your question. The rest of actions (copy) are free
In case if you have repeated/record fields - you still can execute above plan, but in #1 you will need to use some BigQuery User-Defined Functions to have proper schema in output
You can see below for examples - of course this will require some extra dev - but if you are in critical situation - this should work for you
Create a table with Record type column
create a table with a column type RECORD
I hope, at some point Google BigQuery Team will add better support for cases like yours when you need to manipulate and output repeated/record data, but for now this is a best workaround I found - at least for myself
Below is the code to do it. Lets say c is the column that you wants to delete.
CREATE OR REPLACE TABLE transactions.test_table AS
SELECT * EXCEPT (c) FROM transactions.test_table;
Or second method and my favorite is by following below steps.
Write Select query with the columns you want to exclude.
Go to Query Settings
Query Settings
In Destination setting Set destination table for query results, enter project name, Dataset name and table name exactly same as you entered in Step 1.
In Destination table write preference select Overwrite table.
Destination table settings
Save the Query Setting and run the query.
Save results to table is your way to go. Try on the big table with the selected columns you are interested, and you can apply a limit to make it small.
Is there a way to retrieve the field names from an actual query, similar to how you can retrieve field names from a table using the INFORMATION_SCHEMA? In essence, I'm wanting to accept an entire query as a parameter, and be able to build an empty table with the field names from said query.
Right now, I'm using a STUFF() function to replace the SELECT with SELECT TOP 1 and replacing the FROM with a INTO tablename FROM, and then truncating tablename. It works, but I need this to be able to handle complex queries where the first occurrence of FROM might not be the one I need (in case the user is using a subquery for a field, for example).
I am helping a small school with their database which I created three years ago and that works fine.
I am now creating a attendance register as a new feature to it and am struggling with the update query fields.
I have two tables and one append query which works well with the form I have created. I have combobox to filter the class to check the register which works well. The problem I am faced with is when running the query, it updates all 180 students and not the ones filtered per class.
I need to append the data only for the class selected. Thank You
Please help.
Harry
It seems that you wish to only update or append the rows that match the combobox on your form. You can refer to an open form in a query in MS Access. With your append query in design view, under the field that you want to match and type in Form! followed by the name of your form, another dot or exclamation, and the name of your combo, say:
Forms!Form1!Combo0
In SQL View an append query would look something like:
INSERT INTO Table1 ( AText )
SELECT Table2.AText
FROM Table2
WHERE Table1.ID=[Forms]![Form1]![Combo0]
Similarly for an update query:
UPDATE Table1b
SET Table1b.ADate = Date()
WHERE Table1b.ID=[Forms]![Form1]![Combo0]