sql primary vs unique key e1549018196336 Difference between Primary key and Unique key SQL Primary Key Constraint

Difference between Primary key and Unique key

var gaJsHost = ((“https:” == document.location.protocol) ? “https://ssl.” : “http://www.”); document.write(unescape(“%3Cscript src=’” + gaJsHost + “google-analytics.com/ga.js’ type=’text/javascript’%3E%3C/script%3E”)); try { var pageTracker = _gat._getTracker(“UA-11608194-1”); pageTracker._trackPageview(); } catch(err) {} Both Primary key and Unique key enforce uniqueness of the column on which they are defined but still there are some differences between them. The differences are defined […]

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SQL CONSTRAINTS e1549017687548 Sql server Constraints - Primary Key, Foreign Key, Unique Key, Not Null, Check Constraints SQL Primary Key Constraint

Sql server Constraints – Primary Key, Foreign Key, Unique Key, Not Null, Check Constraints

Introduction A constraint is a property that is assigned to a column or a group of columns to prevent incorrect or corrupt data from entering into the tables. These constraints ensure the accuracy and reliability of the data into the tables. This article will tell about the Sql server Constraints – Primary Key, Foreign Key, […]

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