I am trying to make a SQL Query. So There are 3 sections available,Method 1,2 and 3. If A Group+SG Combination is found anywhere, we take that value based on the following hierarchy: Method3>Method2>Method1. Finally, In the output, we have That particular as Final Group and Final SG, And the value is pi…
Tag: mysql
what are the alternative approaches to optimize this sql query?
I am just a beginner in sql and i am trying to optimize sql query but couldn’t get any idea yet, so i am sharing the query with you guys if anybody help me out through this will be very appreciated. Tables are already indexed but if you have any composite indexing approach or anything you can share it. …
Getting an output based on conditions and creating a new column and updating it based on a condition in SQL
We have two tables: “riders” and “drivers”. Some riders are also drivers, so will show up on both tables. Each table looks like this: Table riders I have tried this code: Write a query that outputs all SF riders and add a column called ‘flag’ that prints ‘true’ if the rider is also a SF driver and ‘false’ if …
What is the syntax error in this simple SQL query for creating a table?
I am trying out IntelliJ’s DataGrip to do some SQL work on a MariaDB database. Somehow i cannot execute the query that was automatically created by DataGrip itself…. Can you help me find the error in it ? The error is I tried to validate the query with an online validator and it seems fine… …
MYSQL Trigger not adding count after inserting rows into another table
This is a continuation of this question: Insert data into a table with a foreign key SQL I need to create a trigger that updates a counter variable after I insert a row into a table. The counter variable keeps track of how many new rows are inserted into the ItemBook table. However, after running the script, …
Deleting records in MySQL WHERE id IN (@VARIABLE) — (2,3,4)
Is there is a way to delete records using WHERE IN @VARIABLE? Create variable: I’m trying to remove concatenated variables from string. The above SQL removes only first element from the list. In this example, list will contain: (2,3,4). Only the record with id = 2 will be removed. Records with id 3, 4 w…
Skip rows in an unsorted list
I have an Angular app which displays a list and a Scala API which provides data. I encountered a problem (and the languages don’t matter, is just about logic). The problem is that the table from which I get data doesn’t have a primary key. Because I need to display the data plain in a widget (of t…
Why this mysql statement returns whole table?
I am wondering that how this query returns all data from the table: It gives the same output of this: It is probably works as this: but, WHY? Answer Break the WHERE condition down, and this starts to make sense: All rows with an email attribute set to a blank string ” will return TRUE. For a minute, let…
Max from joined table based on value from first table
I have 2 tables. First holds job details, second one the history of those job runs. First one also contains job period, per customer which is minimum time to wait before running next job for same customer. The time comparison needs to happen on started_on field of second table. I need to find out the job ids …
SQL mixed String with leading zeros
I want to get the maximum value of a table and then add that with +1. The problem here is that the column contains leading zeros and the length of the column cannot be greater than 4. Here an example: Tablename: car id C001 C002 … C009 I have tried to solve this problem with this sql Query: result: C001…