WebFeb 25, 2011 · A "clustered index" defines the order the rows are stored. A "key" defines the row of data. The "primary key" is simply the key used to best define which row is which. … WebMar 4, 2024 · The primary key consists of one or more columns. The primary key enforces the entity integrity of the table. No NULL columns are allowed. The primary key uniquely …
Primary key vs Unique key - SQL Server Forums
WebThrough this post, I will consolidate all relevant information regarding the attribute properties and try to put it under one roof. A dimension attribute contains a limited list of key values. Each unique key is associated with a dimension member and these dimension members included in the attribute are called attribute members. WebInterview question for QA Analyst. SQL queries : ———————- 1. Difference between Delete & Truncate ? 2. Difference between Order By & Group By? 3. If there are 11 table how many joins will be used to join all of them ? 4. How to retrieve number of records from table ? 5. Retrieve highest second salary record from 2 tables ? 6. registering partnership for self assessment
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WebExecute the above script, and it creates the table, primary key and unique key constraint. It creates the SQL Server index for primary key constraints and unique key constraints. We … WebMay 19, 2024 · The difference between Primary key, Unique key and Foreign Key is the most common interview question for .NET as well as SQL developers. The PRIMARY Key … WebSQL UNIQUE Constraint. The UNIQUE constraint ensures that all values in a column are different.. Both the UNIQUE and PRIMARY KEY constraints provide a guarantee for uniqueness for a column or set of columns.. A PRIMARY KEY constraint automatically has a UNIQUE constraint.. However, you can have many UNIQUE constraints per table, but only … pro btp formation continue 2021