Hi I'm super new to postgresql and I am trying to view data from just one column of my table. However, all the things I've found online so far are about viewing all the content available in the table. Is there any way to view the entries of just one column?
Related
I want to link the dashboards for each row in the table in my Grafana dashboard, which has a table visualisation. I tried using a data link, but it is linking to the entire table when I only wanted it for one row.
I tried using a data link, but it inserted the entire table when I only wanted it for one row.
A specific row in the table can be linked to the dashboard.
I've been experimenting with Flutter DataTables and everything works fine displaying a table.
However, I'm also looking to allow users to edit the table. I'm populating the table with textfields but am at a complete loss as to how to get tabular data back out of the table. Getting individual cell values isn't a problem, it's trying to get its row and column positioning that I'm unable to do.
Any suggestions?
I need to update a mapping table in postgresql, but of course it won't allow me to replace/drop the original table as there are dependencies.
The error message details does list the dependent views, but I'd like to generate a list programmatically so that I can make temp views while I drop my original mapping table and migrate the views back afterwards.
Prefer not to do this in SQL Shell incidentally. Any pointers would be much appreciated.
The table with blue header is normal mysql table, while the one with yellow header is view table. I used reversed engineering to import these tables into mysql workbench and trying to place relationship among them using existing columns, but I can't expand and see the columns of view table.
It is the limitation of mysql workbench, or actually it is possible to expand the view table? If it is able to expand, can someone please guide me on this?
Thanks!!
This is currently a limitatiion and, to my surprise, not something that people requested in the past. If you like you can open a feature request at http://bugs.mysql.com to get this implemented.
If i want to insert few rows in the middle of the existing table, how do i approach it? Where all that i should be careful when doing such thing? Is there any good sample source available?
Appreciate your helps.
Thank you.
Tableviews don't contain data and they don't actually contain rows themselves. Instead, tableviews are just an illusion created by redisplaying the same tableviewcell objects over and over again with different data each time. The real table, the real rows, are actually in the logical data.
So, to " insert few rows in the middle of the existing table" you actually add the rows into the data that the table displays. For example, if you had a simple array of names that you display in the table, you would insert the new names into the array. Then you would call -[UITableView reload] which will cause the table to ask the datasource for the new data.
See the Table View Programing Guide for iPhone OS.
Insert the data into your model and call reloadData on the table. If you need to animate the insertion for some reason, you can use insertRowsAtIndexPaths:withRowAnimation:, but the principle if updating the model first still applies.