im new in sql. I cannot get data with format what i want in one step. Now i’m using more sql commands. I want to get all data in one command because i cant to connect them in subquery with group by. Somebodys can help me? example of Table i have: id order_id order_status 1 1 0 2 1 0
MYSQL how to merge rows with same field id into a single row
I have a select statement with rows as table_Schema I need to merge the rows such that blogs with same row id are merged into a single row. I am trying to get either <author fname, author mname, author lname | coauthor fname coauthor lname> or a column as author co author Each blog can have multiple aut…
Percentage based on another column, with group by
This is what I have: getting this one: I want to have additional column, telling me per day how much is my success rate. E.g. 210/(210+40) for day 5, 40/(32+40) for day 6 etc: Answer This way you can get the rates (success/failure) for equivalent status type. Output:
How to count if the difference of two consecutive rows is greater than 0?
Suppose the following table, The final output I am trying to achieve is, where Change is a counter which increments given the difference between any two consecutive rows (value rows) is not 0. How may I achieve this using mysql? Answer LAG() can be used to fetch the preceding row: LEAD() can give the same res…
Why can’t I create a view with a visual interface?
When the narrator in the video I watched on the Internet creates a view, he adds tables to the view with a visual interface as in the 1st picture, and sets the relations between the tables. But when I create a view, a code screen greets me and I need to create a view with code. Why can’t I create
How to update table in pl/sql?
Example contrived for this question. Two tables, Project and Employee. Employee has a project id foreign key. Query needs to select all the projects that are of year 2021 with ongoing status in Employee table for each record from above select statement (1), create a new row in project table and set year to 20…
What does default do in CHARACTER SET and COLLATE when creating a database?
The mysql docs tell me that you can optionally specify DEFAULT for these two lines, but what does it actually do? How is DEFAULT CHARACTER SET different from CHARACTER SET? (The same goes for collate) Answer There’s no difference. They do the exact same thing, whether you use the DEFAULT keyword or not.…
Join the tables one to many but duplicate the records bigquery
i’m working on bigquery. I have two tables: one for sites and one for site logs. I want to make a query that selects all the sites (without duplicating them) and tells me the last status by date. I also want to know what answer team 1 or team 2 gave for each site. I do left join and duplicate
ERREUR : Unknown column ‘Accessoires’ in ‘where clause’
My query is throwing up this error while i have column Accessoires in table categorie Can anyone see why? I FIXED IT LIKE THIS: Answer Using bound parameters with a prepared statement likely fixes your bug and also solves the severe security issue. The likely reason your code has failed is that test was ̶…
Copy data from one set of tables to another with extra columns [closed]
Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 8 months ago. Improve this question Is there any quick way for the below one? instead of generating Insert into Select SQL quer…