Let’s get the names of the countries without duplicates. Solution: We’ll use the keyword DISTINCT. Here’s the query: SELECT DISTINCT country FROM City; Here’s the result of the query: country Spain Poland Discussion: If you want the query to return only unique rows, use the keyword ...
“Unable to enlist in the transaction” with Oracle linked server from MS SQL Server [<Name of Missing Index, sysname,>] in non clustered index [Execute SQL Task] Error: The value type (__ComObject) can only be converted to variables of type Object. [ODBC Driver Manager] Data source nam...
Adding multiple items to Dictionary Adding multiple rows to a datatable Adding multiple worksheet to Excel using Openxml Adding new columns dynamically Adding results of SQL query to an iEnumerable string adding scrollbar to dropdownlist Adding values inside the datatable to a Dictionary in VB.net ...
Being able to locate one specific row in a table is a fundamental feature of SQL. In fact it's a requirement offirst normal form. Take the username for accounts in your application. To ensure someone has entered the correct password and pull up their details on login you need to find th...
1 row in set (0.00 sec) To delete this row you would run aDELETEoperation that hasFROMandWHEREclauses identical to the previousSELECTstatement: DELETE FROM clubEquipment WHERE brand='Korgi'; Copy Output Query OK, 1 row affected (0.01 sec) ...
that’s already been inserted into it. For example, you may need to correct a misspelled entry or perhaps you have new information to add to an incomplete record.Structured Query Language— more commonly known asSQL— provides theUPDATEkeyword which allows users to change existing data in a ...
How to Find Duplicates Over Multiple Columns Using SQL ServerTry this one:
This archive contains slew of posts on how to use SQL to solve problem. If you have a question about a particular issue, or technique, you may find a solution here. For instance, here is one of our more “fun” article on how to use SQL to create a bar chart: How to Create A ...
7. What is a Query? A query, in SQL, is a command used to request data or update information from a database table or combination of tables. Users can write and execute queries to retrieve, delete or update information in a database. Usually, a query response returns data from different...
Indexes. They're one of the most powerful and misunderstood aspects of SQL performance. In this post we'll look at the purpose of an index, how to create and choose choose your index type. Then finish with a discussion of how to decide what to index and