I’m trying to count the post count of each tag, then orderBy by the post count. But there was a problem when counting the number of posts: tags with no posts were not displayed. I want if any tag has no post, it will still be printed. What should I do. Answer you can use LeftJoin to show all rows
Tag: sql
Multiple location to reference location dimension
I am trying to map values associated to my location dimension – dimension seen below: LocationID Country State City Zip Code Longitude Latitude 1 USA NY Manhattan 2 USA NY Yonkers 3 USA NY Buffalo I am receiving transaction data where multiple regions may be identified as a value. For example, I will ge…
SQL Server – Can’t change datetime to date
I have this sql which has some date format issue, problem is that I can freely change EndDate to whatever I want, but for StartDate I can’t seem to change it one bit, it always have this timestamp that I am trying to get rid of. Basically whatever I do in varchar, date or any format I just can’t c…
In Postgresql, how do I use joins with multiple conditions including >= and <=
I have table A and table B. Each row in table A represents every time a user sends a message. Each row in table B represents every time a user buys a gift. Goal: for each time a user sends a message, calculate how many gifts they’ve purchased within 7 days before the timestamp they sent the message. Som…
use desc as a field name in Spring boot entity class
The table was not being created for the following model despite following the correct procedure Model Answer So I was creating an entity class for JPA where there was a field name desc. I was using MySQL database. But for some reason, I was getting the following error. The model Later I changed the field name…
Execute Query Inside Column From CTE
I have a CTE table which returns dynamic SQL. Here is my CTE query: which returns: I want to execute each row on the CTE table. How can I do that? Answer With just a couple of tweaks
Select into a temporary table efficiency is faster than direct query
Case: Query below sql need 10.56 sec, and 236 rows were queried. Estimated Execution Plan: Most cost: After I try to use select into temporary table then it just need 0.03 sec Estimated Execution Plan: Then I’ve tried add below index, but it still no change. hct_mlots table create sql，total rows 88790 m…
How to return the number of sets for each date
I am running a query that returns: I need to also return the number of Sets for each date: Answer You may add the count window function to your select clause eg Mysql 8+ Older Mysql Versions You may use variables or aggregates to achieve your count Schema (MySQL v5.5) Query #1 Date Set Data NoSets 2021-07-02 …
Move values in different columns to one row
I have the following table: With this sample data: Id is my primary key, and this should be UNIQUE in the table. This is possible for all of my rows, if I simply move all values up to one row in the above example. I only need to make this work when data looks like it is in the above
Oracle database – update table with random value from literal table, but change data per row
I want to randomly pick a data tuple from a literal table to fill in another table, and randomize the row to pick each time. With the below query, I fill all rows with the same data, so I think the random row is picked once and used everywhere. So how can I get a random row for each row