Cars VALUES ('sedan', 10000, 'red'), ('convertible', 15000, 'blue'), ('coupe', 20000, 'red'), ('van', 8000, 'blue'); SELECT Model, Color, Price FROM (SELECT TOP(1) Model, Color, Price FROM dbo.
Cars WHERE Color = 'red' ORDER BY Price ASC) AS a UNION ALL SELECT Model, Color, Price FROM (SELECT TOP(1) Model, Color, Price FROM dbo.
Once you have declared a record in your block, you can both read and change the record’s value.
You can do this at the record level or by referencing individual fields of that record, with the same dot notation used in SQL to refer to the column of a table.
Because the MERGE statement performs a full table scan of both the source and target tables, I/O performance can be affected when using the TOP clause to modify a large table by creating multiple batches.
It is possible to write a query that returns unexpected results because the order in which the TOP and ORDER BY clauses are logically processed is not always intuitive when these operators are used in a select operation. Cars(Model varchar(15), Price money, Color varchar(10)); INSERT dbo.
USE Adventure Works2012; GO -- Select the first 10 random employees.
SELECT TOP(10)Job Title, Hire Date FROM Human Resources.
Employee SET Vacation Hours = Vacation Hours 8 FROM (SELECT TOP 10 Business Entity ID FROM Human Resources.
Here are the answers to the PL/SQL Challenge questions in last issue’s “Error Management” article: Answer 1: Choices (a), (c), and (d) all raise ORA-00001, also known as DUP_VAL_ON_INDEX inside PL/SQL code.
PL/SQL makes it very easy to declare records that have the same structure as a table, a view, or the result set of a cursor by offering the %ROWTYPE attribute.