Selecting the length of a varchar column. : VARCHAR « Data Types « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Data Types » VARCHAR 
5. 27. 3. Selecting the length of a varchar column.
6CREATE TABLE publishers(
7>    pub_id         char(4)           NOT NULL,
8>    pub_name       varchar(40)           NULL,
9>    city           varchar(20)           NULL,
10>    state          char(2)               NULL,
11>    country        varchar(30)           NULL DEFAULT('USA')
12)
13> GO
1>
2>
3insert publishers values('1''Publisher A', 'Vancouver',  'MA', 'USA')
4insert publishers values('2''Publisher B', 'Washington', 'DC', 'USA')
5insert publishers values('3''Publisher C', 'Berkeley',   'CA', 'USA')
6insert publishers values('4''Publisher D', 'New York',   'NY', 'USA')
7insert publishers values('5''Publisher E', 'Chicago',    'IL', 'USA')
8insert publishers values('6''Publisher F', 'Dallas',     'TX', 'USA')
9insert publishers values('7''Publisher G', 'Vancouver',  'BC', 'Canada')
10insert publishers values('8''Publisher H', 'Paris',      NULL, 'France')
11> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)
1>
2>
3>
4>      SELECT    DATALENGTH(name)
5>      FROM      syscolumns
6>      WHERE     id = OBJECT_ID('publishers')
7>      AND       name = 'pub_id'
8>
9> GO

-----------
         12

(rows affected)
1>
2> drop table publishers;
3> GO
1>
5. 27. VARCHAR
5. 27. 1. To use a string literal or a date literal in a comparison, enclose it in quotes.
5. 27. 2. Varchar type value pattern matching
5. 27. 3. Selecting the length of a varchar column.
5. 27. 4. How to concatenate string data
5. 27. 5. How to format string data using literal values
5. 27. 6. How to include apostrophes in literal values
5. 27. 7. VARCHAR(MAX)
5. 27. 8. Replace the string '102' located at offset 9 (zero-based) with the string 'one hundred and two'
5. 27. 9. City name is Dallas
5. 27. 10. The IN() Function matches a field to any number of values in a list.
5. 27. 11. Use REPLICATE to fill a varchar type variable
5. 27. 12. CONVERT(varchar(12), OrderDate, 111)
5. 27. 13. Performing String Concatenation
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