Suppose I have a table:
Name, status, timestamp I want to choose matching Status =’active’ rows, but only those rows with the latest timestamp are selected. So if there are rows like this:
Tag: Medium
How do I scroll to the last line of the SQLITE model in the QTableView?
I have a Sqlite model with a few thousand rows connected to a QTableView. I can view the rows in the QTableView, but when I scroll to the bottom of the QTableView, I can only reach the first few hu
Name and Comment interchange in PowerDesigner
Reproduced from: http://blog.csdn.net/xuxile/article/details/49817385
Execution method: Open PDM – Tools – Execute Commands – Run Script
Vb script code:
Add a code display in the table display in PowerDesigner
1.”Tools”->”Display Preferences…”
2. Select “Table” and click “Advanced”
3. Select “Columns”, Click the search icon to the right of “List columns”
4. Select “Code”, move it to the top, and click “OK”. Don’t forget to click “OK” on the other parent pages.
The objects in PowerDesigner16 are invalid, and there is no solution to the extension attribute problem.
The object in PowerDesigner16 is invalid and no extended attributes are allowed
message 15135, level 16, state 1, process sp_addextendedproperty, line 37The object is invalid. ‘XXXXXXX’ does
NOSQL – anyone uses Hyperdex in production?
I just noticed that the relatively new open source noSQL database “HyperDex” was not mentioned in the S.O. question. Also-is anyone using it? How does it compare with other noSQL engines? We are
How many data have each node in the NOSQL – Cassandra cluster?
When do the boundaries of SSTables compression (primary and secondary) become invalid?
If I have the main compression of 500G SSTables and my final SSTable will exceed 1TB-is this effective f
Cluster key in Nosql – Cassandra
On a given physical node, the rows of a given partition key are stored in the order triggered by the clustering key, making the retrieval of the rows in this clustering order particularly effective
How to store video in the PostgreSQL database?
I store image files (such as jpg, png) in a PostgreSQL database. I found information on how to do that here.
Similarly, I want to store videos in a PostgreSQL database. I searched on the Inte
PostgreSQL function card in the For loop
The function was stuck before the loop.
select * from scm_main.fn_connection_stations(1219646) Print the message “Start…” but not the message “…End”.
CREATE OR REPLACE FUNCTION
scm