Recently,I have reviwed the basic of SQL and found A question about index. My Working environment is as follows: os: Centos 7 mysql: 5.7.39 database: sakila table: customer AND My question is why Innodb uses idx_fk_store_id instead of the primary…
I am having 3 tables - student, department and exam_results. What I am trying to do here is to select all of the department/s name/s which have the highest grade for example 6. I have tried the following query but…
I am trying to count matching values from customer column on table 'Customers' and update their values on the Count Column in table 'Summary'. I also want to Check if the Date is <= Todays Date. Table "Customers": ID Customer…
I am trying to display the data of a table containing an image in blob format, but I can only get the last inserted record to be displayed. I would like to show all the records with their respective images,…
I have a MySQL database with lots of entrys with columns like "local_time", "temp", "wind", etc. What I want to archive is get in just one query the MIN value for temp, the MAX value for temp in each day…
I'm thinking my way to do that is a little archaic, not optimized... i don't need super detailed statistics, lets say i want the number of clicks on a link on a blog post per (actual) day/week/month/year nothing more, don't…
I want to select rows from tags table where tag name includes SOMETHING. The results must be sorted in a smart way: records which start with SOMETHING should go first, and then should go the rest. It can be easily…
Say I have the array: $myArray = ["hello", "and"]; and then I have a table like: id text 1 "hello larry!" 2 "hello bob, and how are you?" 3 "and what are you up to?" How can I run a…
name -- country -- order john Abraham -- USA -- burgar john Abraham -- USA -- cake john Abraham -- USA -- sugar CR RONALDO -- PORT -- burgar MESSI GAR -- ARG -- burgar john Abraham -- FRA --…
I am searching for the solution for this problem for hours now with no luck. I have a Workouts table as below. Each item in the workout table can have multiple target muscles, which are listed in the Target Muscles…