dbms ไทย บทที่ 08 การใช้งานคำสั่ง select...
DESCRIPTION
DBMS ไทย บทที่ 08 การใช้งานคำสั่ง SELECT ขั้นสูงTRANSCRIPT
8 SELECT
8 SELECT SELECT SELECT , (SUBQUERY), SELECT
SELECT TblCustomers, TblOrders TblOrdersDetails GROUP BY HAVING
GROUP BY (Aggregate Function) Aggregate SQL SERVER 2005 Aggregate Aggregate Function
AVGMAXMINSUMCOUNTSTDEVSTDEVPVARVARP
Aggregate (OrderID) (ProductCount) TblOrderDetails 10278
SUM 10278 16+31+4=51
Note
SQL SERVER 2005
SELECT SUM 10278 GROUP BY Aggregate
GROUP BY ( OrderID) SUM
GROUP BY 30 HAVING WHERE
HAVING 30
GROUP BY Aggregate Aggregate GROUP BY Aggregate Aggregate
OrderID ProductCount SUM GROUP BY
1 GROUP BY GROUP BY Aggregate GROUP BY
ProductName Aggregate GROUP BY
GROUP BY SELECT FROM
OrderID GROUP BY SELECT TblOrderDetails
HAVING WHERE WHERE Aggregate WHERE Aggregate HAVING Aggregate
WHERE NULL ALL GROUP BY ORDER BY
ORDER BY ORDER BY 2 1. SELECT 2.
ASC DESC ASC ProductCount 3 ProductCount SELECT OrderID ProductCount
SELECT SELECT ProductID ProductName TblProducts ProductCount TblOrderDetails
ProductID TblProducts ProductID TblOrderDetails ProductID TblOrderDetails
SELECT JOIN Inner Join Outer Join Inner Join Self Join Inner Join ( ZipCide) TblCustomers Cross Join Inner Joins
Inner Joins 2 =, >, <
TblProducts Inner Joins ProductID TblProducts ProductID TblOrder Details = (ProductID) TblOrder Details
Transact-SQL Inner Joins TblProducts Inner Joins TblProducts TblOrder Detail
Cross Joins
Cross Joins Cartesian Product Cross Joins
Cross Joins TblOrders TblOrderDetails
Outer Joins
Inner Joins Inner Joins
Inner Joins ProductID TblProduct ProductID TblOrderDetails Outer Joins Outer Joins Outer Joins 3 Left Outer JOIN Inner Joins Left Outer JOIN NULL
Left Outer JOIN Table1 Table2 Left Outer JOIN COLUMN2=COLUMN3 2 (D E) Table1 Left Outer JOIN ( C D) Table2 NULL
Transact-SQL Left Outer JOIN Inner Join Inner Join Left JOIN ProductCount TblOrderDetails Left Outer JOIN ProductCount NULL NULL
Right Outer JOIN Left Outer JOIN Right Outer JOIN Right Outer JOIN Right Outer JOIN NULL
Full Outer JOIN Left Outer JOIN Right Outer JOIN Full Outer JOIN
Self Joins
Self Joins Inner Joins Self Joins Zipcode () TblCustomers Zipcode Orders
Self Joins TblCustomers ZipCode
Transact-SQL TblCustomers OtherCus NOT LIKE
SUBQUERY
(SUBQUERY) SELECT SELECT SELECT
GOOFY GOOFY 1. Transact-SQL GOOFY SELECT GOOFY2. GOOFY
3. Transact-SQL SELECT ZipCode 10110 GOOFY
SUBQUERY
< , >, = 10110 GOOFY
GOOFY () SOME, ANY, ALL = SOME, ANY =ANY
SOME, ANY GOOFY ()
ALL >, <
2 (CategoryID=2) Note
ORDER BY SELECT
SUBQUERY [NOT] IN
IN =ANY, =SOME NOT IN < > ALL [NOT] EXISTS
EXISTS EXISTS EXISTS TRUE
TblProducts TblOrderDetails EXIST TRUE WHERE TblProducts
NOT EXISTS EXISTS EXISTS SELECT * EXISTS Correlated SUBQUERY
Correlated SUBQUERY Correlated SUBQUERY WHERE FROM SELECT Correlated SUBQUERY ProductID TblProducts
WHERE ProductID TblProducts FROM SELECT Correlated SUBQUERY
Correlated SUBQUERY SUBQUERY
SELECT SELECT ORDER BY TOP INTO ntext, text image =, >, < GROUP BY HAVING ANY, ALL, SOME
SELECT INTO
INTO SELECT INTO SQL SERVER 7.0 INTO select into / bulkcopy SQL SERVER 2000 2005 Aggregate CREATE TABLE XREATE TABLE
INTO New_Table ProductCount Aggregate Sum Of ProductCount
SELECT UNION
SELECT UNION SELECT UNION
UNION SELECT SELECT UNION SELECT ORDER BY SELECT UNION ALL UNION
UNION SELECT ProductID ProductName TblProducts SELECT CustomerID CustomerName TblProducts UNION ProductName