I am using MySQL and facing a question. I want to count the consecutive occurrence of type based on each ID and select out only the IDs with more than 3 times of error-type. Additionaly, based on the above result,…
Here is a MySQL request that works without a hitch : DROP PROCEDURE IF EXISTS my_procedure; DROP DATABASE IF EXISTS test_db; CREATE DATABASE test_db; USE test_db; CREATE TABLE test_table (test_data varchar(255)); INSERT INTO test_db.test_table VALUES ('test_data1'); delimiter // create procedure…
I have a PHP script that use 4 separate query to read the last 25 rows from one single mysql table (so a total of 100 rows). Example: SELECT * FROM table WHERE datetime <= 'xxx' AND name = 'john'…
I have searched a lot for this answer on the internet but no luck so far... I am using VSCode with python to run queries in MySQL database. I have installed "MySQL" extension so i can run queries from an…
I am trying to get a table of an average for a column, across multiple rows (if that makes sense). For example, in the table below, I need to group the postcodes (as there can be more than 1 suburb…
I want to migrate my app to clusters so I have to deal with mysql locking. For this post, I have simple table with 'id' and 'flag' whether is record updated or not. There are 3 threads reading table of…
Basically, I'm trying to find ways to explore SQL Injection vulnerabilities in the code presented below. The code has another layer, presentation, where it asks the user for board_name input. Table_name is an inside variable, user doesn't have control over…
I am trying to narrow down the results returned from a JOIN so that the shared value equal a specific value. The basic query which returns the entire contents of the tables. SELECT t1.c2, t2.c3 FROM t1 INNER JOIN t2…
For a table like this named Activity: player_id device_id event_date games_played 1 2 2016-03-01 5 1 2 2016-03-02 6 2 3 2017-06-25 1 3 1 2016-02-02 0 3 4 2018-07-03 5 I wonder why the following query only returns the…
Getting Connection Lost in coorelated queries. select emp_no,salary from salaries e where 2 = (select count(distinct salary) from salaries p where p.salary>e.salary); I tried this to get second highest salary but its giving me sql connection lost every time. All…