I have a table in SQL server 2008 R2 where I am storing values of translations.
The translated values can be a text or it can be an image also. We want to use same column for storing the image and text so when we do a search we don't have to give 2 queries based on type of data.
my question:-
1. Can I store image and text in the same column?
2. should I do that? or should i have 2 different columns? (one with varbinary and other simple nvarchar)?
As to 1 - you can... just use a varbinary and handle everything else on the client side...
As to 2 - you SHOULD NOT use 1 column for both... but 2 columns (one varchar, one varbinary) !
Related
I am using Tableau Prep to load PDFs to SQL server. The PDF contains several tables. All the columns except the one with NULL values is not created. If there are 12 columns in the PDF, I'm seeing only 11 in the Output. There's a column that has NULL values. Is there a way to create a column to have NULL values? The column is blank initially(eg, Jan, and values are being populated from Feb onwards) and then is being populated with float values. The PDF's need to be loaded daily. I created the column but it gives an error 'Error adding Text[columnname]. Expected different text.' Prep Version is 20.3.3.
Do I continue loading the Jan files and then is it possible to add the column and map it Feb onwards?
Is there another way to accomplish this?
Thank you in advance.
A little late answering but, you can add a null column as follows:
After connecting to your pdf table, add a Clean activity
Select data grid view and right click on a column
Select Create Calculated Field then Custom Calculation
Name your calculation and set the calculation value as NULL
Reset the data type as Number (decimal)
Add an output activity, saving output to Database table
I have 3 tables on mysqlworkbench, 1 table need to combine with 2 data ch(17million row) and cl(9million row) suppose to be one table, other table name alldoc.(121k)
Basically i need to combine ch and cl as one table, and compare with alldoc data. Technically they are suppose to be same but people made mistake that why i need to compare. 100 column
enter image description here
enter image description here
I plan to write query till i hit to 100 because i have 100 columns in all data. Just rows sizes are different.
Thank you from advance. I know complicated but i really need to compare these two data writing query
I have a table in tableau with say 4 columns (Say Employee ID, Name, Address, Email).
I want to provide the users an option to select single/multiple columns from a drop down list (assume in the drop down list we have columns headers, Customfield1, Customfield2.....,Customfield10) which would be added to the table as a separate columns.
Say for Instance if the user selects CustomField1, CustomField2, CustomField3 from the drop-down list then the table should have in total of 7 columns (4 Emp fields + 3 Custom Fields)
Though I stated a simple requirement, my idea was to extrapolate that to something complex.
I think some version of this could be done, albeit in a hacky way. What you're looking for is 'Dynamic Parameters.' They don't technically officially exist in the product, but can be created with the combination of parameter and calculated field.
Here is a link to a method on such creation.
The idea here would be to re-order columns in a custom manner. Each calculated field would have to have its own logic for which dimension it was to display when a user selected a parameter. (ie: With parameter selection A Column 1 goes to [Name] and Column 2 goes to [Address], and with parameter selection B Column 1 goes to [Address] and Column 2 goes to [Name].) The caveat here is that each potential layout would need to have the same number of columns - there is not a way to add columns dynamically. Consider that each column is represented here with a calculated field.
Good luck on it.
I'm working in Pentaho 4.4.1-GA (Kettle / PDI). The database is Postgres.
I need to be able to insert multiple records into a fact table based on the fields that come from a single record. The single record contains fields:
productcode1, price1
productcode2, price2
productcode3, price3
...
productcode10,price10
So if there was a value for each of the 10 productcode / prices then I'd need to insert a total of 10 records into the fact table. If there were values for 4 of the combinations, then I'd need to insert 4 records into the fact table, etcetera. All field values for the fact records would be identical except for the PK (generated by sequence), product codes, and prices.
I figure that I need some type of looping construct which would let me check whether or not a value was present for each productx field, and if so, do an insert/update step on the fact table with the desired field values. I'm just not sure how to do this in Pentaho.
Any ideas? All suggestions are welcome :)
Thank You,
Rakesh
Could you give a sample input and output for your scenario??
From your example data I can infer that if there are 10 different product codes and only 4 product prices you want to have 4 records inserted into your table. Is that so?
Well for a start you can add a constant value of 1 to those records by filtering for NOT NULL and then use an Group BY Step to count the number of 1's. This would give you the count. BTW it would be helpful if you could provide more details on what columns you would be loading as there are ways to make a PDI transformation execute multiple times
I have been asked to determine how much data our application uses and how fast it is growing. The problem is many applications share the same database and tables with a column being used to determine which application the data belongs to. It is a DB2 database.
Is there any way to find the size in bytes of all the columns a table uses for a given row? It is important that I select only those rows that belong to my application.
If a column is not nullable I do not include it in the SQL I just multiply its size by the row count. I am primarily trying to determine the average size of nullable and variable size columns (we use VARCHAR and BLOB).
At the moment what I am doing looks something like this:
SELECT VALUE(LENGTH(COLUMN_1), 0) AS LEN_COL_1, repeat for each variable size column
FROM TABLE T
WHERE T.APP_ID = my app
The most accurate way to determine size would be to look at the sizes of the files that make up the DB2 tables.
Divide the file sizes by the percentage of rows that belong to your application.
This way, you count most of DB2's overhead size, including indexes.