I have two tables with the following schema as example: scala> df1.printSchema root |– id: string (nullable = true) AND scala> df2.printSchema root |– col1: string (…
How to export only data from a database in SQL DEVELOPER
I want to export my data base in parts, like the tables, the data, etc. So I would like to know how i can export only the data from a date base in SQL developer preferebly in the application tools.
Preserving times Class with sqldf
I am using sqldf to join several tables, but I am having trouble preserving the times class set with the chron package on a column. I used the method=”name__class” argument to the sqldf function and …
Starting from a column type, how to find supported aggregations in Postgres?
I’m trying to figure out from a column type, which aggregates the data type supports. There’s a lot of variety amongst types, just a sample below (some of these support more aggregates, of course): …
Create a new column which shows the last enquiry date based on ID using SQL
I have the EnquiryDate and the ID column. I am trying to create the ‘previous_EnquiryDate column. Previous enquiryDate is based on ID. For each ID, when is the most recent enquiry that came in …
MySQL how to get 2nd most recent record in linked table in search query [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 years ago. Improve this question I have a MySQL DB with two linked tables Products and Price History. They are linked by a pr…
HR user does not have access to DBA_TAB_COLUMNS
I am studying Oracle Database and solving review questions. There is a questions and answer about dictionary views that I do not quite understand: You need to get information about columns in a …
Adding Where Clause To Query Skews Result Set
I am attempting to include all data from my calendar table and only the data from my sales table that meets the where criteria. My issue is that the query I am executing ONLY returns the months that …
How I pass the id from one table in a row in another table?
I am generating some football fixtures and what I try to do is to insert the fixtures and the games in two tables. The fixtures table is good to go but I am struggling with inserting matches in the ‘…
Postgres group by empty string question to include empty string in output
I have following table in Postgres | phone | group | spec | | 1 | 1 | ‘Lock’ | | 1 | 2 | ‘Full’ | | 1 | 3 | ‘Face’ | | 2 | 1 | ‘Lock’ | | 2 | 3 …