I have a column of type object, and i need to make it from another object type, (the table is empty ) i tried to do : ERROR: function pg_catalog.btrim(invoice_item) does not exist LINE 1: …ory ALTER COLUMN invoice_info TYPE invoice USING (trim(invoi… ^ HINT: No function matches the given name and argument types. You might need to add explicit
Tag: sql
Fill NA and update columns from another dataframe
I want to conditionally fill the missing and update the value from another dataframe. I want to fill missing and update the data on column values in dataframe smalldf. The condition is, if the value in B column (large df) is in the range of columns Range_FROM and Range_TO in (small df). Always choose the minimum records in (largedf) to
How to expand date ranges by taking into account overlapping days in PostgreSQL?
Given the following table created in a PostgreSQL database using the following SQL statements: The table represents the list of reservations of a Bed&Breakfast with check-in date and check-out date. It is requested to retrieve how many rooms should be set up and available for each week. In order to reduce maintenance expenses, it is required to minimise the number
How can I write an SQL query as a template in PySpark?
I want to write a function that takes a column, a dataframe containing that column and a query template as arguments that outputs the result of the query when run on the column. Something like: func_sql(df_tbl,’age’,’select count(distinct {col}) from df_tbl’) Here, {col} should get replace with ‘age’ and output should be the result of the query run on ‘age’, i.e.
TSQL – New column value based on other columns with highest level of match
So I’ve got a mapping table with the following information: And another fact table with the following info: Ideally I should add CCode in the fact table with the highest matching value of Number (first) & FCODE (second) So for example the first record: Number: 0123456789 FCode: 12345 should result to have value CCode 6 to be added in the
SELECT … WHERE Query in DAX
I have a SQL query: I want to rewrite it with DAX, but it isn’t working. Here is what I have now: How would I create a similar query with DAX? Answer The SQL predicate that is used here translates to starts with ds. Example The exact DAX equivalent Measure would be Internally FILTER ( VALUES ( ‘Table'[doc] ), LEFT
Get Substring between two characters in SQL Server query
I want to get the string between two characters in the following string: I want to get the text between the @ and the SPACE after the @ which results in user1, is there a way to do this? There could even be 2 or more @ which I will need to extract like here is a table-like example: Sample
Is this ERD correct?
This ERD is part of my school work and something doesn’t seem right. The ERD table ‘Course’ looks like its referencing 2 tables. Is the column titled ‘Qual_Code’ in table ‘Course’ from the ‘Prerequisite’ table, the ‘Qualification’ table or both? I don’t think its both because you cannot have a single column with a foreign key that references two different
Table recursive lookup on itself
I have the following table below. I want to select all of the members of Group-D However, Group-D also contains Group-C along with User 5. Group-C contains Group-A and Group-B. So, the select should return: Obviously, without doing multiple lookups on itself, I will not get that output. How can I make the select statement do a table lookup within
using Query one results to run Query two
This code would result with this Result What I would like to do is when the code above gets the results my bottom code reads them and runs them trough its code. The common denominator here would be the account number because its running through a different table I have tried doing this the code below but it doesnt seem