I’m doing this leetcode question on SQL, and I have some questions that I wanted to ask you. This is my solution: My questions are: First, is my solution true? Is it necessary select distinct * from sales ? I do it whenever I see This table has no primary key, it can have repeated rows. The others didn&…
Print a custom message when no rows are returned by a SELECT statement
I am trying to create a report of INVALID objects in Oracle. The requirement is to print a custom message when no rows are returned (This is because the output will be redirected to an HTML report). I tried the following query: Error am seeing: While the individual queries work without an issue, it fails to e…
Select one of two columns based on their value in SQL
I have a scenario where I have a users table where users are connections to each other based on the connections table. The connections table has a user_id1 field and a user_id2 field. I want to get the connections for a specific user: But the user_id’s of the connections are separated into two columns. …
mysql query error: SQL sum with condition
This is my code: select assignedstfid, staffname, staffsymbol, SUM(case where bookingstarttime > ‘2021-03-31’ then TIMESTAMPDIFF (minute, bookingstarttime, bookingendtime) else 0 end) as …
Analysis of the completeness of the availability of products from the ClickHouse SQL database
Documentation: https://clickhouse.tech/docs/en/ Goal: 85% of the brand’s product range should be available for purchase Calculate the number of products of each brand by availability (maxItems > 0)…
Interval to previous row
I would like to get the interval between the rows in my table. When I use this query I get seconds from previous timestamp. But the result is only right when two timestamps is in the same minute. …
Run-Time Error ’13’ Type Mismatch – ACCESS DATABASE
I am trying to compare two text fields txtTrailerNumber and txtSealNumber to the database table Tab_TrailerDetails. [TrailerNumber] and [SealNumber] as listed in the table. I am trying to get the …
Syntax error while using WHERE clause in PostgreSQL
I’m trying to run some queries related to the University database in PostgreSQL. To find students advised by instructors from different departments, I used- However im getting the following error: ERROR: syntax error at or near “where” LINE 3: student join instructor where student.dept_name …
Oracle create league table from football results
Having the below table DATE_MATCH HOME_TEAM AWAY_TEAM HOME_GOALS AWAY_GOALS 03-APR-21 Alaves Eibar 2 1 02-APR-21 Alaves Huesca 3 0 01-APR-21 Eibar Huesca 1 1 31-MAR-21 Huesca Eibar 2 0 30-MAR-21 …
How to get min and max from 7 columns in Hive Hue excluding zeros
I have a table which has 9 columns. Below is the structure of it I need the min and max of these columns for a row excluding zeros. Below is the required table structure If you see the columns min and max, min is minimum of 7 cols (col1 to col7) in a particular row excluding zero and max is