Reference a declared variable in an update statement : Update « Insert Delete Update « SQL Server / T-SQL

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SQL Server / T-SQL » Insert Delete Update » Update 
Reference a declared variable in an update statement

 


2CREATE TABLE employee(
3>    id          INTEGER NOT NULL PRIMARY KEY,
4>    first_name  VARCHAR(10),
5>    last_name   VARCHAR(10),
6>    salary      DECIMAL(10,2),
7>    start_Date  DATETIME,
8>    region      VARCHAR(10),
9>    city        VARCHAR(20),
10>    managerid   INTEGER
11);
12> 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',    4234,'2007-07-17','West','Regina',9);
2> GO

(rows affected)
1INSERT INTO employee VALUES (9'Joan'  ,  'Act',    6123,'2001-04-16','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             4234.00 2007-07-17 00:00:00.000 West       Regina                         9
          Joan       Act             6123.00 2001-04-16 00:00:00.000 North      Toronto                       10

(rows affected)
1>
2>
3> SET QUOTED_IDENTIFIER OFF
4> GO
1>
2> DECLARE @ValueToUpdate VARCHAR(30)
3> SET @ValueToUpdate = "Mick"
4>
5UPDATE Employee
6>    SET First_Name = @ValueToUpdate
7> GO

(rows affected)
1select from Employee;
2> GO
id          first_name last_name  salary       start_Date              region     city                 managerid
----------- ---------- ---------- ------------ ----------------------- ---------- -------------------- -----------
          Mick       Martin          5890.00 2005-03-22 00:00:00.000 North      Vancouver                      3
          Mick       Mathews         4789.00 2003-07-21 00:00:00.000 South      Utown                          4
          Mick       Smith           6678.00 2001-12-01 00:00:00.000 North      Paris                          5
          Mick       Rice            5567.00 2006-03-03 00:00:00.000 South      London                         6
          Mick       Black           4467.00 2004-07-02 00:00:00.000 East       Newton                         7
          Mick       Green           6456.00 2002-05-19 00:00:00.000 East       Calgary                        8
          Mick       Larry           5345.00 2008-03-18 00:00:00.000 West       New York                       9
          Mick       Cat             4234.00 2007-07-17 00:00:00.000 West       Regina                         9
          Mick       Act             6123.00 2001-04-16 00:00:00.000 North      Toronto                       10

(rows affected)
1>
2>
3> drop table employee;
4> GO

 
Related examples in the same category
1. Updating Rows Based on Multiple Tables
2. An UPDATE statement can only modify data of a single table
3. Update statement and IN operator
4. Modify rows of a table with an expression
5. Update a single column
6. Change more than one column by adding a comma and the additional column expression
7. Using an expression in our UPDATE statement
8. Update command with where condition
9. Update more than one columns in update clause
10. Update a single row
11. Use CASE in the UPDATE statement
12. Updating a Column Value
13. UPDATE with a Join
14. Math operator in update statement
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