The JOIN operations, which are among the possible TableExpressions in a FROM clause, perform joins between two tables. If you only want to return a single table's information, you can try alias. COLUMN ALIASES are used to make column headings in your result set easier to read.
* to select all the columns from a that table only. SQL Table Alias with JOIN, Not working. TLEA. Here’s an example: UPDATE employee_test e SET e.salary = 42000, e.dept_id = 2 WHERE e.last_name = 'SMITH'; This query gives the table alias “e” to the employee_test table, and all of the columns within the query are prefixed with the table alias. Problem: List the total amount ordered by customer with easy to read column headers SELECT C.Id AS Identifier, C.LastName + ', ' + C.FirstName AS CustomerName, SUM(O.TotalAmount) AS TotalSpent FROM [Order] O JOIN Customer C ON O.CustomerId = C.Id GROUP BY C.Id, C.LastName + ', ' + C.FirstName ORDER BY TotalSpent DESC SQL table aliases can also be used in UPDATE statements. (You can also perform a join between two tables using an explicit equality test in a WHERE clause, such as "WHERE t1.col1 = t2.col2".) – Haris Khan Aug 5 '16 at 15:16 Here’s the table before the update: Oracle ALIASES can be used to create a temporary name for columns or tables. TABLE ALIASES are used to shorten your SQL to make it easier to read or when you are performing a self join (ie: listing the same table more than once in the FROM clause). (e.g. *) If you need certain columns from certain tables, or all columns from both tables, you'll have to list them.
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