NULLs Sort Last : Order by « Query « SQL Server / T-SQL Tutorial






  1. SQL Server / T-SQL Tutorial
  2. Query
  3. Order by
4>
5>
6> CREATE TABLE Customers (
7>      CustomerID nchar (5) NOT NULL ,
8>      CompanyName nvarchar (40) NOT NULL ,
9>      ContactName nvarchar (30) NULL ,
10>     ContactTitle nvarchar (30) NULL ,
11>     Address nvarchar (60) NULL ,
12>     City nvarchar (15) NULL ,
13>     Region nvarchar (15) NULL ,
14>     PostalCode nvarchar (10) NULL ,
15>     Country nvarchar (15) NULL ,
16>     Phone nvarchar (24) NULL ,
17>     Fax nvarchar (24) NULL
18> )
19> GO
1>
2> INSERT Customers VALUES('1','A','Maria',    'Sales',  'Str. 57', 'Berlin'    ,NULL,'12209', 'Germany','111-1111111','111-1111111')
3> INSERT Customers VALUES('2','M','Joe',      'Owner',  'Ave. 231','Vancouver' ,NULL,'05023', 'Mexico', '(222) 222-3332',NULL)
4> INSERT Customers VALUES('3','H','Thomas',   'Sales',  'Sq.  111','London'    ,NULL,'1D00P', 'UK',     '(444) 444-4444','(444) 444-4444')
5> INSERT Customers VALUES('4','B','Berg',     'Order',  'Blv    8','Toronto'   ,NULL,'00222', 'Sweden', '4444-55 55 65','5555-55 55 55')
6> INSERT Customers VALUES('5','S','Moos',     'Sales',  'Fort  57','New York'  ,NULL,'68306', 'Germany','6666-66666','6666-77777')
7> INSERT Customers VALUES('6','F','Cite',     'Manager','24      ','Dalles'    ,NULL,'67000', 'France', '88.60.15.31','88.60.15.32')
8> INSERT Customers VALUES('7','C','Sommer',   'Owner',  'Araq, 67','Paris'     ,NULL,'28023', 'Spain',  '(91) 555 22 82','(91) 555 91 99')
9> INSERT Customers VALUES('8','P','Leb',      'Owner',  '12      ','Beijing'   ,NULL,'13008', 'France', '91.24.45.40','91.24.45.41')
10> INSERT Customers VALUES('9','D','Elizabeth','Manager','23 Blvd.','Tsawassen','BC', 'T2F8M4','Canada', '(604) 555-4729','(604) 555-3745')
11> go

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)

(1 rows affected)
1>
2>
3> SELECT
4>   *
5> FROM
6>   Customers
7> ORDER BY
8>   CASE
9>     WHEN Region IS NULL THEN 1
10>     ELSE 0
11>   END,
12>   Region
13> GO
CustomerID CompanyName                              ContactName                    ContactTitle                   Address                                                      City            Region
       PostalCode Country         Phone                    Fax
---------- ---------------------------------------- ------------------------------ ------------------------------ ------------------------------------------------------------ --------------- ---------
------ ---------- --------------- ------------------------ ------------------------
9          D                                        Elizabeth                      Manager                        23 Blvd.                                                     Tsawassen       BC
       T2F8M4     Canada          (604) 555-4729           (604) 555-3745
9          D                                        Elizabeth                      Manager                        23 Blvd.                                                     Tsawassen       BC
       T2F8M4     Canada          (604) 555-4729           (604) 555-3745
1          A                                        Maria                          Sales                          Str. 57                                                      Berlin          NULL
       12209      Germany         111-1111111              111-1111111
2          M                                        Joe                            Owner                          Ave. 231                                                     Vancouver       NULL
       05023      Mexico          (222) 222-3332           NULL
3          H                                        Thomas                         Sales                          Sq.  111                                                     London          NULL
       1D00P      UK              (444) 444-4444           (444) 444-4444
4          B                                        Berg                           Order                          Blv    8                                                     Toronto         NULL
       00222      Sweden          4444-55 55 65            5555-55 55 55
5          S                                        Moos                           Sales                          Fort  57                                                     New York        NULL
       68306      Germany         6666-66666               6666-77777
6          F                                        Cite                           Manager                        24                                                           Dalles          NULL
       67000      France          88.60.15.31              88.60.15.32
7          C                                        Sommer                         Owner                          Araq, 67                                                     Paris           NULL
       28023      Spain           (91) 555 22 82           (91) 555 91 99
8          P                                        Leb                            Owner                          12                                                           Beijing         NULL
       13008      France          91.24.45.40              91.24.45.41

(8 rows affected)
1>
2>
3> drop table Customers;
4>
5> GO
1>








1.3.Order by
1.3.1.The expanded syntax of the ORDER BY clause
1.3.2.ORDER BY Clause: ORDER BY {[col_name | col_number [ASC | DESC]]}, ...
1.3.3.Sorting your grouped results with ORDER BY clause.
1.3.4.An ORDER BY clause that sorts by one column in descending sequence
1.3.5.the order criterion may contain more than one column.
1.3.6.An ORDER BY clause that sorts by three columns
1.3.7.An ORDER BY clause that uses an alias
1.3.8.An ORDER BY clause that uses an expression
1.3.9.An ORDER BY clause that uses column positions
1.3.10.Sorting your grouped results by an aggregate.
1.3.11.NULLs Sort Last
1.3.12.order criterion contains any aggregate function.
1.3.13.Order by not null date
1.3.14.Using the TOP keyword with Ordered Results
1.3.15.do our sorting using numeric fields
1.3.16.use CAST function to sort during ordering