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Oracle column alias. When you query data from a table, Oracle uses the column names of the table to display the column heading. For example, the following statement returns the first name and last name of employees: SELECT . first_name, last_name. FROM . employees. ORDER BY . first_name; Code language: SQL (Structured Query Language) (sql)
Omit the AS for table alias in Oracle. SELECT G.Guest_ID, G.First_Name, G.Last_Name FROM Guest G JOIN Stay S ON G.Guest_ID = S.Guest_ID WHERE G.City = 'Miami' AND S.Room = '222'; This will give you the output without errors.
Let's look at an example of how to alias a table name in Oracle/PLSQL. For example: SELECT p.product_id, p.product_name, categories.category_name FROM products p INNER JOIN categories ON p.category_id = categories.category_id ORDER BY p.product_name ASC, categories.category_name ASC; In this example, we've created an alias for the products ...
18 maj 2021 · An alias can be used to rename the tables that are used in your SQL query. The syntax of table aliases is: SELECT column_1, column_2, … FROM table_name AS alias_name; Let’s apply this syntax to an example. We’ll use the same table: customers. SELECT customer_name, age FROM customers AS c WHERE c.age . 60
The alias effectively renames the select list item for the duration of the query. The alias can be used in the order_by_clause but not other clauses in the query." – ypercubeᵀᴹ
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.
10 cze 2023 · The syntax of a table alias is: SELECT columns FROM table [AS] alias_name; The alias_name is the name given to your table to be used in the query. The alias you use will often be a short one. Most of the aliases I use and see in other people’s code are one to three letters long.
