MySQL 5.7 Consider the following sample data: CREATE TABLE catalog_product_entity_media_gallery ( `value` VARCHAR(24), `entity_id` INTEGER ); INSERT INTO catalog_product_entity_media_gallery (…
How to combine these two queries from different tables into one to calculate percentage?
I have the following query which has the students attendance in the period: And I have the lesson count in the same period. I’d like to divide total_presences by lessons count to get the students attendance percentage. How do I do that in a single query? Answer Probably the easiest way is to use a CTE: …
does mySQL database work separate from programming languages [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago. Improve this question I want to make sure about somethings if I build a project and use SQL data…
How to Group By in SQL Server Query
I’m using this query to get the Sum of SaleAmount for each type (SOType) of Sale Invoices. I am getting the result but the result is not grouped by SOType. Have tried to use Group by Outside the query …
Update a column in table A based on values in table B using a CASE statement
I got a tricky question. I would have a table A that is composed of two columns A.ID and A.Cat1_Avail. The Cat1_Avail-column is empty as of now. I would like to update the values in A.Cat1Avail based on a logical question. In particular, I have another table B that is composed of B.ID and B.Feature. B.Feature…
How to update a column based on values of other columns
I have a tables as below I have to update var_start_date column with min(reporting_date) for each combination of id,code,sub_code and item_nbr only till variance field is zero. Row with variance = 0 should have null var_start_date. and next row after that should have next min(var_start_date.). FYI, variance i…
How to minimize my query to fast the query time in my navicat?
FROM table p WHERE p.column = 0 ) as zxc ORDER BY zxc.column DESC Answer Please try this change-
Aggregation of Json objects on a relational table on Postgres
I have a relational table that contains three variable values, an ID, and the date broken down into parts. ID | Year | Month | Day | A | B | C | 1 2019 12 01 5 10 15 1 2019 …
Mysql GROUP BY too slow. Any help to make it faster?
So I have a JS script which people embed into their sites and it tracks all the URLs and clicks of visitors. Each visitor gets “Token” which is unique value to them and is used to track their actions …
Removed the last element from a json[]?
I have a json[] array (_result_group) in PostgreSQL 9.4, and I want to remove its last json element (_current). I prepared with: _result_group := (SELECT array_append(_result_group,_current)); And …