I have table like this I need to delete all duplicated rows with equals A nad B value and lower C value after running sql script i need to have only this row with top C Value for every equals A and B columns this is the sql query i am using how to convert it to liquibase query Answer
Tag: sql
Boolean value not being changed in database
Hey folks I’m having a problem with my code. For some reason when I try to change the value to false, it doesn’t reflect in my SQL Database. I debugged and it does get set via Java, but it doesn’t transfer over. I’m working on a notification service class and it sets the values on ther…
Combining Data from Multiple Rows in Simple Database
I am new to using SQL. I have constructed the following simple database, which has the ID of music albums and the number of copies bought. In the album_ID column, there are two pieces of data with ID 1. They have quantity_bought values of 10 and 4. Is it possible to combine these two rows into one row which h…
How to extract values from array json column into multiple rows in Postgresql?
How can I extract values from the json arrays in ranges column as multiple rows Postgresq? Expected result: Start End 1 100 101 1000 1001 2000 2001 2002 Answer You can use jsonb_to_recordset function for this : http://www.sqlfiddle.com/#!17/22d62/10
sql: query to find max count with extra columns as well
Input table:events GOAL I want max(distinct user) grouped by month column. my final result need two columns one is month and another one is max_count I need output similar to this I followed some approach Approach1: if i follow this approach, it is just giving me only max_count but i need month column as well…
SQL – on which context do SELECT…FOR UPDATE and UPDATE work?
I would like to have a question about data contexts on which do the transaction operate with different commands. Are there any differences in SELECT…FOR UPDATE and UPDATE in terms of contexts of data? What I mean by this: if I run the following transaction (pseudo-code): What this actually does is that …
How to use a sub-query to pick out corresponding value for another minimum
I’m trying to find a name of a Community Area that corresponds to the minimum safety score in another column. Current code is resulting table What I want is a table that has COMMUNITY_AREA_NAME defined as WASHINGTON PARK and SAFETY SCORE defined as 1. COMMUNITY_AREA_NAME SAFETY_SCORE WASHINGTON PARK 1 D…
Duplicates in pre-aggregated sub-query sql
I have two tables with many-to-many relationship. I am trying to get values from both of the table where UserId is unique (I’m joining these table on this value) I am rying to use pre aggregated query, but I get error Column ‘clv.ProbabilityAlive’ is invalid in the select list because it is …
Concatenate from rows in SQL server
I want to concatenate from multiple rows Table: |id |Attribute |Value | |——–|————|———| |101 |Manager |Rudolf | |101 |Account |456 | |101 |Code |B | |102 |Manager |Anna | |102 |Cardno |123 | |102 |Code |B | |102 |Code |C | The result I’m looking for i…
Recursive SQL query for finding matches
I have 5 SQL Tables with the following columns: As input data I have employee_id and request_id. I need to figure out whether the employee has access to the request (whether he’s a manager or not) We cannot use ORM here since app’s responsiveness is our priority and the script might be called a lo…