To select everything from a table, use * (asterisk operator) Select * from employee; After writing the query, click on the execute button to check for errors Once the query is executed, the table appears Select Distinct in SQL A column often contains many duplicate values, and sometimes the...
TheUNIONoperator in SQL tells the database to merge two separate result sets retrieved through individualSELECTqueriesinto one result set that contains rows returned from both queries. Note:Databases don’t restrict the complexity of theSELECTqueries used withUNION. The data retrieval queries can incl...
SQL contains string - In this blog, I will explain how to check a specific word or character in a given statement in SQL Server, using CHARINDEX function or SQL Server and check if the string contains a specific substring with CHARINDEX function. An alternative to CHARINDEX() is using LIKE...
SQL Server query optimizer decides to use an index seek operator when the operator cost is low and it can easily find matching records using the B-Tree structure. An index seek operator provides significant performance gains. In the below picture, theEstimated Number of Rows to be Read...
In theProvider stringbox, type Excel 8.0 for an Excel 2002, Excel 2000, or Excel 97 workbook. ClickOKto create the new linked server. Note In SQL Server Management Studio, you cannot expand the new linked server name to view the list of objects that the server contains. ...
ClickOKto create the new linked server. Note In SQL Server Management Studio, you cannot expand the new linked server name to view the list of objects that the server contains. Enterprise Manager (SQL Server 2000) In Enterprise Manager, click to expand theSecuri...
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
SQL check constraint and user-defined functions A scalar-valued user-defined function returns a single value after its invocation. We can use this type of function in the check constraints to define a data validation rule. At the same time, we can pass the inserted data value to this functio...
Parent topic:Understanding How to Use SQL*Loader 7.2SQL*Loader Parameters SQL*Loader is started either when you specify thesqlldrcommand, or when you specify parameters that establish various characteristics of the load operation. In situations where you always use the same parameters for which the ...
Appending text to a field that already contains text using TSQL apply cross apply function on condition Arabic question mark Arduino and SQL Server Are there any Bitmap(ped) indexes in SQL Server? Are there MIN(A,B) or MAX(A,B) functions in SQL? Argument data type datetime is inval...