What is SQL Homework Help?
SQL (which stands for Structured Query Language) is a way of interfacing with databases. It is mostly standardized and so you can use the same syntax, no matter which database you are actually using, from MySQL, Oracle SQL, Sqlite (built into Python), PostgreSQL. Although the name SQL implies it is used for retrieving data, SQL is used to define that database itself, and to insert data as well. If you imagine we want to store a list of students and the courses they are taking, we need to define 3 tables. The first table would be the students information, such as the first and last name, the gender, email address and phone number, in addition to that though is an index field which is normally automatically created as an integer that increments each time a new record is added, this is called the key, and is how we link different tables together. So the course table, may give the course name, then we would have another table, consisting of 2 keys one of which is the student and one of which is the course id. To find the students taking a particular course, we would use a join to find all the students in course / student table where the course is the one we are searching for.
SQL is an old technology and still widely used, although sometimes it can be hidden behind an abstraction layer called an ORM (object relational mapper) which converts between object orientated classes and the database. ORMs are used in Django (a web framework in Python), Hibernate (ORM for Java).
We can offer SQL assignment help with either direct SQL code, or code using an ORM. Some assignments may require you to write triggers or SQL procedures, this is code that runs on the database rather than in the programming language you are using to interface with the database. One problem with SQL is called SQL injection, which can occur if you accept unfiltered input from the user and then construct queries using the data provided by the user directly. You need to be aware of this and you can mitigate it by using prepared queries rather than building the query string by string manipulation techniques in the programming language you are using to interface with SQL. At Programming Homework Helper, we are aware of this and ensure that you don’t have problems with SQL injection during any SQL homework help we provide. Another way of accessing databases is called NoSQL and is based on JSON stored data and is used in MongoDB and a few other databases, we can also provide No SQL assignment help, NoSQL is easier to use but not as widespread and possibly does not scale as well. PostgreSQL also allows you to store json data directly in the database and is probably a better solution that a NoSQL database. If you are submitting an assignment and it needs to run on a particular database and that is not mentioned in the assignment (say you are doing a course on Oracle databases) then please mention that and we can ensure that it works correctly under the database you are using.