I want to get all Titles and Scores for a Given skill Id, every skill has titles mandatorily but there may not be records in the Answer table matching the condition A.[ServiceId] = 45 in this case i still need to display all the Titles and 0 as score For this purpose i made LEFT Join and still it doesn’…
Tag: left-join
Get one record per ID
I’m trying to retrieve data from 2 tables A&B. , there are multiple data rows in B for each PrimaryKey from A. But I want to get only the first record for every ID from tableA. How can I achieve this? Answer SQL tables represent unordered sets so there is no first row. But you can get an arbitrary r…
SQL Statement summarize missing employee certifications
I am trying to create a report on tables that I can’t modify and am not sure if this is even possible. Using the script below, I am trying to get a query result of: Answer You can cross join employees and certifications to generate all possible combinations, then use a subquery to check whether each tup…
Counting organizations which user has not contacted
I am new at PostgreSQL. I have the following tables created in my schema: User table: Organization table: And finally Organization_rating table: With this schema, an organization has a business type in which gives support to the user that also have that business type. After giving this support, the user can r…
How to pull the count of occurences from 2 SQL tables
I am using python on a SQlite3 DB i created. I have the DB created and currently just using command line to try and get the sql statement correct. I have 2 tables. When I setup table two, I added this statement in the creation of my messages table, but I have no clue what, if anything, it does: What
Is there a way to return 0 if values does not exist in table using SQL Server
I have put down below a query to retrieve from four tables which are Query: The query is working well but if the Expense table has no values Expense.Invoice_No does not match with Sales_Invoice.Invoice_No, then the query above will return empty rows. But what I wish to do is that, if Expense.Invoice_No does n…
Select first and nth order for each client
I’m trying to display first and fifth order_id for each user. Table looks like this: I wrote something like this: But I want to see clients who made their first orders but don’t have fifths. There should be NULL, but I can’t understand how to make it. :c Answer Put the where t2.rn = 5 condit…
Joining table which may not exist with where clause
I have two tables. Let’s say they are: I’d like to make a join to get customer name, number of orders which he/she has finished and sum of money which he/she has spent in total So I’m making this SQL query: If a customer has any finished orders then it will get everything right. But if there…
Conceptual explanation: why COUNT() syntax doesn’t work on SQLZoo JOIN Lesson Challenge 13?
I’ve got solutions here in stack overflow for SQLZoo Join Lesson Challenge 13 problem link: https://sqlzoo.net/wiki/The_JOIN_operation solution link: SQLzoo JOIN tutorial #13 But, before to use the solution that I found here, I was trying: But the answer is always wrong. I have a spreadsheet where I put…
Using left join to query and match JSON field in MySQL
Table A,field : pay_type_fk,type:json, Examples Data: [1,2,4] Table B,field : id type : bigint Examples Data: primary key SQL I use: Only pay can be found_ For the first record in the type table, I think we can query all of them with group_ CONCAT Answer If I follow you correctly, you can join on JSON_CONTAIN…