Write an SQL query to find the team size of each of the employees. The answer above is correct I am just confused as to why you use a LEFT JOIN on two tables that are the same. Answer The best way to understand what is happening is to just view the intermediate table which results from the self join.
I was asked the following pseudocode in a SQL interview based on joining condition. Can anyone explain what went went wrong with my approach?
[two tables-ta and tb with respective columns ] I was asked to put a LEFT JOIN on item id and explain what would be the possible output. I wrote a pseudocode like this- I told them the output would look like this, which they told is not the right answer. Can anyone explain what would be the correct answer alo…
Cohort Analysis using SQL (Snowflake)
I am doing a cohort analysis using the table TRANSACTIONS. Below is the table schema, Below is a quick query to see how USER_ID 12345 (an example) goes through the different cohorts based on the date filter provided, The result for this query with the time frame (two weeks) would be and this USER_ID would be …
I’m getting the OleDb exception ‘Unspecified error the scale is Invalid’ when trying to use a stored procedure
I made a stored procedure in SQLExpress to insert information in both the Header and Details table. I’ve ran the stored procedure in SQL Server Management Studio to make sure it works fine. But when I try to use the stored procedure using TableAdapters in visual studio it gives me the error: System.Data…
Connect MQTT Message with clienID of Publisher
I want to store MQTT data in an MySQL db and want to store the client id, topic and message content. With some devices, I have no control over the topic or message syntax, so it will not be possible to attach the client id to the message or add the client id in the topic. Is there a possibility
How to get the second row by date and by id, without group by (not sure about row number)
My dataset is about sales, each line corresponds to an invoice. It is possible to have 2 registers in the same day for the same customer, if he had bought twice in that day. As you can see in the …
Distinct Count with data from another table
I have 4 tables All ID related things are ints and the rest are texts. I want to count the number of albums the user is tagged at so if a user is tagged in album1 once album2 once and album3 once it …
How can I optimize Postgresql ARRAY_AGG queries for large tables?
I am using PostgreSQL for its array functionality. Here’s my schema: CREATE TABLE questions ( id INTEGER PRIMARY KEY, product_id INTEGER UNIQUE NOT NULL, body VARCHAR(1000) NOT NULL, …
SQL command not properly ended – INSERT MULTIPLE ROWS – SQL
I don´t know why SQL Developer returned “SQL command not properly ended” when i tried to add multiple rows. When i tried to insert one row, all was ok. Can somebody help me? Thanks. INSERT …
SQL query to return record if the price is higher and the ID is lower than previous ID and price records
I’m having issues writing a SQL query to return a record when I have a dataset similar to the following: id price 32967 39 14675 40 26434 41 18495 42 19698 43 19090 44 9278 45 14932 46 I …