Data modeling with SQL is a process aimed at building such a database that will be the best possible representation of the business requirements by ensuring data integrity and efficiency. It consists ...

As you continue to explore the intricacies of table structures, understanding the role and functionality of constraints becomes essential. Constraints are rules that we apply to data columns in a ...

The ease and ubiquity of SQL have even led the creators of many “NoSQL” or non-relational data stores, such as Hadoop, to adopt subsets of SQL or come up with their own SQL-like query languages.

So, it is a good physical database design practice to implement referential integrity using database constraints. Ignoring the relationships does not eliminate the business requirement. Proper ...

Signal loss along the data paths is still an issue but, in most cases, can be handled with the materials currently available used to fabricate PCBs and backplanes. However, as the shift is made to 56 ...

insert into emp10 values(2,'')--ERROR, CANT INSERT NULL VALUES BECAUSE WE HAVE DEFIEND CONSTRAINED AS NOT NULL insert into emp10(empno) values(3)--ERROR, CANT INSERT NULL VALUES BECAUSE WE HAVE ...

Check constraints are supported in all of the major DBMS products, including DB2, Oracle, and SQL Server. But they are too-often ignored and not implemented in production databases. Properly defined, ...