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Oracle Alias. Summary: in this tutorial, you will learn how to use Oracle alias including column and table aliases to make the heading of the output more meaningful and to improve the readability of a query.
You can use AS for table aliasing on many SQL servers (at least MsSQL, MySQL, PostrgreSQL) but it's always optional and on Oracle it's illegal. So remove the AS: SELECT G.Guest_ID, G.First_Name, G.Last_Name FROM Guest G
SQL aliases are used to give a table, or a column in a table, a temporary name. Aliases are often used to make column names more readable. An alias only exists for the duration of that query. An alias is created with the AS keyword.
This Oracle tutorial explains how to use Oracle ALIASES (temporary names for columns or tables) with syntax and examples. Oracle ALIASES can be used to create a temporary name for columns or tables.
17 gru 2019 · Using AS to assign meaningful or simpler names. You can use AS to assign a name to a column of data you are selecting or that has been calculated. SELECT user_only_num1 AS AgeOfServer, (user_only_num1 - warranty_period) AS NonWarrantyPeriod FROM server_table. This results in output as below.
7 sty 2020 · In ORDER BY you can refer to column aliases in the SELECT clause. This is what's happening in query 2. It isn't sorting by the values in the column. It's sorting by the values from the product and country. So for product TOTALs it sorts the values DK, GB, US, TOTAL => DK, GB, TOTAL, US.
14 wrz 2021 · SQL aliases are custom names that you can give to the columns and tables you include in your queries. Aliases are very useful, as they can greatly improve the readability and maintainability of your query. We’ll be taking a closer look at using SQL aliases with JOIN and why you might need to do so. The best way to master aliases in SQL is ...
