I am attempting to DECLARE a variable then SET it’s value using a secondary variable which has already had it’s value set. I have tried: To no avail. The result of the final SELECT statement is null. The following works: but I have several tables linked via dependencies and to delete an entry I ne…
Tag: sql
How to solve syntax error with `ALTER TABLE` query?
I’m having issues with syntax error in my queries, I’m trying to alter my table. Answer Looking at your question I dind’t know what you were trying to rename if it was your table name or the column name. For SQL Server to rename your column you can do this: With your code should look like this: Otherwis…
Best way to update the same column without using x update statements (if possible)?
I have a few questions regarding the following scenario – Consider this table (db<>fiddle here): I want to replace each class subject with a number code. For example: If I try to do this in one update statement, it won’t let me do that. The only thing I could think of was four separate state…
Pivot/Unpivot SQL Result Set Column Names into Separate Column
I have a result set something like this: Username Birthday Gender Tom Jan 23 Male I would like to convert it to something like this: Name Value Username Tom Birthday Jan 23 Gender Male I’ve been told Pivot/Unpivot was what I was looking for, but I can’t find any info on pulling the column names. I…
Django ORM compare tuples / lexicographic ordering
As part of some custom cursor-based pagination code in Python Django, I would like to have the below filtering and ordering on a generic Queryset (where I don’t know the table name up front) How can this be expressed in terms of the Django ORM? Note I would like the SQL to keep the tuple comparison and …
Permission denied when using file.remove in R after updating to 4.1.1
After updating from 3.6.3 to 4.1.1 a weekly script I run broke. Specifically it triggers an error: To manually delete temp.csv I get a file in use by rsession.exe error from windows. If I restart R in Rstudio, then both file.remove() and manually deleting work. It might be that I’m using a bad stratgy i…
Convert nested select to join
Account Table: Answer Your query is probably more efficient than a join/group by version, but it is equivalent to: I should note that if all banks have loans (which seems reasonable) no JOIN is necessary:
Ambiguous column name ‘Created_Date’?
I utilize SQL SSMS. Due to the following, SQL prompts error. After I utilized the same script with many other inner joins the following error remains. I have tried to modify my script, and I keep getting the same messages: [My script] Answer You have: But the error message is clear: more than one table in you…
How can I perform the same query on multiple tables in Redshift
I’m working in SQL Workbench in Redshift. We have daily event tables for customer accounts, the same format each day just with updated info. There are currently 300+ tables. For a simple example, I would like to extract the top 10 rows from each table and place them in 1 table. Table name format is Even…
Subtract sum of column from a column in sql
I am inserting First four column multiple times, with new paidVal . Now I want to get sid,snameVal, balance I have used a inner join on studenttbl and feetlb. here I have tried. But I am getting 3 row when I should get 2 only. In the table there is a field cNameVal, and as much different value i m