Lab Sql

I am creating a database in MySQL for school. It has come up with the error 'cannot add foreign… Read more Cannot Add Foreign Key Constraignt Mysql

Above is my simple database design, just wanted to gain information about how things happen as I… Read more Does The Foreign Keys Automatically Get Updated As Primary Table Is Updated?

Please have a look at the below table structure. Client table has the foreign key for Provider Tab… Read more Mysql: Retrieve Data From Multiple Tables

MySQL (mariadb Ver 15.1 Distrib 10.1.44-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2)… Read more Mysql Incorrect Foreign Key

Table DISPLAY_TAB below is a self-reference table that can contain both parent and child tabs. A pa… Read more Cascade Delete In Many-to-many Self-reference Table

Suppose we have 2 tables, a and b: CREATE TABLE a (id_a INT NOT NULL PRIMARY KEY, id_b INT NOT NULL… Read more Would "dereferencing" A Foreign Key In Sql Theoretically Work?

I have a table called 'agenda' //translation: dairy with the following rows: idagenda // pr… Read more How Do I Delete Row With Primary Key Using Foreign Key From Other Table?

I have three tables - file ( file_id int primary key filename text not null etc... ) product … Read more Postgres Unique Combination Constraint Across Tables