Lets imagine i have a table A that contains rows X,Y and Z, and i have another table that relate elements from A to another table B. A_B : element_A, element_B, and i want a query that for element b in B returns for all elements a in A return True if {a, b} exist in the table A_B and
Tag: left-join
count(*) doesn’t return 0
i have a sql problem ,please help me this is my query select count(category_value .list_value_id) as jobs , category_type.value as category from list_values category_type full outer join params …
Join two table with Multiple cases in ON condition
I have two tables A and B and I have to perform left join on that with multiple cases in on condition. Is there any efficient way of doing this in big query or SQL. Here my main motive is that for one row if my case1 matches than it will not go into other cases. Likewise it will work
Combining sql queries together
I am trying to simplify my current query code. Is there a simpler way of combining both queries into one? Here is what I have tried so far. Although it seems really messy and clunky. This query …
Postgres, how to limit number of rows returned from joined tables
I have the following query that return the data I want, however for the joined tables, I want to limit the number of rows returned and preferrably be able to specify for each joined table. I tried …
Postgresql Serial Daily Count of Records
I am trying to get a total count of records from 1st Jan till date, without skipping dates and returning 0 for dates that have no records. I have tried the following: orders is an example table and …
JOIN ON either of the two columns but not both
I have two tables (orders, agents) i’m trying to join on either of the two columns but not both. There are some records in orders that have both of these columns populated and it returns as duplicate orders: agents: I tried joining with an OR clause I’m getting the following results Expected Resul…
How to retrieve a list of results that are NOT in another list with SQL
I have a normalized SQL database. The relevant schema looks like this: I need to get a list of users that have not been sent an email today for a specific category. Based on my understanding, I need to perform a LEFT JOIN. In an attempt to do this, I’ve tried the following: I’m using subqueries in…
Left Join – attempting to identify instances where child records do not exist, or if they do exist, populate unique records meeting specific criteria
I am attempting to search an SQL database for instances where child records do not exist, or if they do exist, they are a specific type (e.g. Historical) and no other types exist (e.g. Current): This populates all of my parent records that do not have any child records without any issues. However, I also want…
How to joins in oracle based on condition
I have two tables as below: Table Apple: Table KEEY: Desired Output: Code Tried So far: This is giving me : I guess i need to use pivot instead of Union to get both the ids on same row. Have you ever encountered such scenarios? Any pointers to proceed will be very helpful. Thanks in Advance! DDL used for the