Performing Flexible Searches Using ISNULL : ISNULL « Data Convert Functions « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Data Convert Functions » ISNULL 
13. 5. 6. Performing Flexible Searches Using ISNULL
3>
4CREATE TABLE employee(
5>    id          INTEGER NOT NULL PRIMARY KEY,
6>    first_name  VARCHAR(10),
7>    last_name   VARCHAR(10),
8>    salary      DECIMAL(10,2),
9>    start_Date  DATETIME,
10>    region      VARCHAR(10),
11>    city        VARCHAR(20),
12>    managerid   INTEGER
13);
14> GO
1INSERT INTO employee VALUES (1'Jason' ,  'Martin', 5890,'2005-03-22','North','Vancouver',3);
2> GO

(rows affected)
1INSERT INTO employee VALUES (2'Alison',  'Mathews',4789,'2003-07-21','South','Utown',4);
2> GO

(rows affected)
1INSERT INTO employee VALUES (3'James' ,  'Smith',  6678,'2001-12-01','North','Paris',5);
2> GO

(rows affected)
1INSERT INTO employee VALUES (4'Celia' ,  'Rice',   5567,'2006-03-03','South','London',6);
2> GO

(rows affected)
1INSERT INTO employee VALUES (5'Robert',  'Black',  4467,'2004-07-02','East','Newton',7);
2> GO

(rows affected)
1INSERT INTO employee VALUES (6'Linda' ,  'Green' , 6456,'2002-05-19','East','Calgary',8);
2> GO

(rows affected)
1INSERT INTO employee VALUES (7'David' ,  'Larry',  5345,'2008-03-18','West','New York',9);
2> GO

(rows affected)
1INSERT INTO employee VALUES (8'James' ,  'Cat',    NULL,'2007-07-17','West','Regina',9);
2> GO

(rows affected)
1INSERT INTO employee VALUES (9'Joan'  ,  'Act',    6123,NULL        ,'North','Toronto',10);
2> GO

(rows affected)
1>
2select from employee;
3> GO
id          first_name last_name  salary       start_Date              region     city                 managerid
----------- ---------- ---------- ------------ ----------------------- ---------- -------------------- -----------
          Jason      Martin          5890.00 2005-03-22 00:00:00.000 North      Vancouver                      3
          Alison     Mathews         4789.00 2003-07-21 00:00:00.000 South      Utown                          4
          James      Smith           6678.00 2001-12-01 00:00:00.000 North      Paris                          5
          Celia      Rice            5567.00 2006-03-03 00:00:00.000 South      London                         6
          Robert     Black           4467.00 2004-07-02 00:00:00.000 East       Newton                         7
          Linda      Green           6456.00 2002-05-19 00:00:00.000 East       Calgary                        8
          David      Larry           5345.00 2008-03-18 00:00:00.000 West       New York                       9
          James      Cat                NULL 2007-07-17 00:00:00.000 West       Regina                         9
          Joan       Act             6123.00                    NULL North      Toronto                       10

(rows affected)
1>
2>
3>
4> DECLARE @EID int
5> DECLARE @StartDate datetime
6> DECLARE @Cost money
7>
8> SET @EID = 1
9>
10SELECT ID, Start_Date, salary
11FROM employee
12WHERE ID = ISNULL(@EID, IDAND
13> Start_Date = ISNULL(@StartDate, Start_DateAND
14> Salary = ISNULL(@Cost, Salary)
15> GO
ID          Start_Date              salary
----------- ----------------------- ------------
          1 2005-03-22 00:00:00.000      5890.00

(rows affected)
1>
2> drop table employee;
3> GO
13. 5. ISNULL
13. 5. 1. The syntax of the ISNULL function
13. 5. 2. Replacing null values with zero values with ISNULL
13. 5. 3. SELECT statement using the ISNULL function
13. 5. 4. System function ISNULL allows a display of the specified value as substitution for NULL.
13. 5. 5. Combine CAST and ISNULL
13. 5. 6. Performing Flexible Searches Using ISNULL
13. 5. 7. Update and ISNULL
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