An index is an on-disk structure. I couldn’t find anything understandable. For example, I found this Is it like a file system? Answer It just means that the index is physically stored on disk, as opposed to “only exists in-memory”. Your link is not related at all.
Tag: sql
mysql 8 pivot query should return a non null value
I would like the following pivot query to show value 0 instead of null, Output for the above is, Employee id 122 does not have a Repayment value so the desired output is, dbfiddle Answer I don’t see the need for the second branch of the repayment case. If you want 0 when the category is not available, j…
How to set default value in sql so that is displays in db
What important in A table is there are three values of type column: New, Activated, Archive. And I set default value 0 to size column of A table and after insert command I expected following result in A table: Query Table A result id b_id type size 1 101 New 10 2 101 Activated 0 3 101 Archive 0 But,
Is there a way to find out the overlap of two time ranges in SQL Server? [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 1 year ago. Improve this question I have four datetime2 columns, each representing either a start or an end to two different ti…
Using rownum in sub query on oracle 11
I have query like this.It is working properly on oracle 12. But I am using oracle 11.That query is not working on oracle 11.Therefore I changed my query like that It gives missing right paranthesis How can I solve this problem.Do you have any idea?Actually I use a variable instead on 10 number. Answer Syntax …
Return only recipes that contains all ingredients Sql
I have these 3 tables: Drinks drink_id name Ingredients ingredient_id name Opskrifter drink_id ingredient_id quantity Drinks and Ingredients are cross-referenced in opskrifter. I want to return all recipes from opskrifter that have ingredients from another table called Stock name So to make a gin and tonic, I…
django get record which is latest and other column value
I have a model with some columns, between them there are 2 columns: equipment_id (a CharField) and date_saved (a DateTimeField). I have multiple rows with the same equipment_id and but different date_saved (each time the user saves the record I save the now date time). I want to retrieve the record that has a…
SQL Query return extra column depending of condition
I want to make a query which will add a column depending of what condition is meet(I have tried with sequelize without obtaining the result that I wanted) therefore I want to try with plain SQL because It does not have as many limitations. EXAMPLE: SELECT * FROM db.messages WHERE user_id = userID OR $contacts…
MySQL tree structure
Hello i am trying to prepare tree structure with MySql, tables look something like this. My Question is: Is it possible to do left join and sort columns by name, but if in lang is eq to “fra” return that row with that name, otherwise return “eng” name. Pseudo code So final result will …
How to display the total count of the last row by filestatus?
I have to display the total count of the last row by filestatus. tbl_bankdata tbl_fileStatus I have two tables tbl_bankdata and tbl_fileStatus. I am sending bank_id in the tbl_fileStatus as a f_bank_id. Now I have to show the last f_bankid count. For example, I have to fetch the count where f_filestatus=1. so…