The term "data integrity" can mean different things to different people, but the most difficult and pervasive problem facing organizations these days is the semantic integrity of the data. As ...

The CHECK constraint limits the value range that can be placed in a column. It ensures only specific values are accepted either on a single column or based on conditions across multiple columns.

When I am working with an Oracle database, I still find myself using SQL*Plus for many quick and dirty database queries. In particular, I often look up constraints in SQL*Plus. In this post, I look at ...

insert into emp values(101,"ram",20),(102,"raj",23),(103,"lalitha",24); insert into emp values (104,"laxmi",18); #age 18 is less than 20, it wont add to the table ...