DDL
| Create | create table emp ( slno tinyint name varchar(10)); |
| Rename Table | Exec sp_rename ’emp’,’employee’ |
| Alter Data type | Alter table emp Alter column slno smallint; |
| ADD Column | Alter table emp ADD DOB Datetime |
| Drop column | Alter table emp drop column name; |
| Rename column | Exec sp_rename ’emp.slno’,’Rno’,’COLUMN’ |
| Drop | Drop table emp; |
SQL SERVER STUDIES
Data type
| DATA TYPE | FROM | TO | |
| bigint | -9,223,372, 036,854,775,808 | 9,223,372, 036,854,775,807 | |
| int | -2,147,483,648 | 2,147,483,647 | |
| smallint | -32,768 | 32,767 | |
| tinyint | 0 | 255 | |
| bit | 0 | 1 | |
| decimal | -10^38 +1 | 10^38 -1 | |
| numeric | -10^38 +1 | 10^38 -1 | |
| money | -922,337,203, 685,477.5808 | +922,337,203, 685,477.5807 | |
| smallmoney | -214,748.3648 | +214,748.3647 | |
| float | -1.79E + 308 | 1.79E + 308 | |
| real | -3.40E + 38 | 3.40E + 38 | |
| datetime | Jan 1, 1753 | Dec 31, 9999 | |
| smalldatetime | Jan 1, 1900 | Jun 6, 2079 | |
| date | Stores a date like June 30, 1991 | ||
| time | Stores a time of day like 12:30 P.M. | ||
| Sr.No. | DATA TYPE & Description |
| Binary | Maximum length of 8,000 bytes(Fixed-length binary data ) |
| Varbinary | Maximum length of 8,000 bytes.(Variable length binary data) |
| Varbinary(max) | Maximum length of 2E + 31 bytes (SQL Server 2005 only). ( Variable length Binary data) |
| image | Maximum length of 2,147,483,647 bytes. ( Variable length Binary Data) |
Character Strings Data Types
| Sr.No. | DATA TYPE & Description |
| Char | Maximum length of 8,000 characters.( Fixed length non-Unicode characters) |
| Varchar | Maximum of 8,000 characters.(Variable-length non-Unicode data). |
| Varchar(Max) | Maximum length of 2E + 31 characters, Variable-length non-Unicode data (SQL Server 2005 only). |
| Text | Variable-length non-Unicode data with a maximum length of 2,147,483,647 characters. |
| Nchar | Maximum length of 4,000 characters.( Fixed length Unicode) |
| Nvarchar | Maximum length of 4,000 characters.(Variable length Unicode) |
| Nvarchar(max) | Maximum length of 2E + 31 characters (SQL Server 2005 only).( Variable length Unicode) |
| ntext | Maximum length of 1,073,741,823 characters. ( Variable length Unicode ) |
| Sr.No. | DATA TYPE & Description |
| Sql_variant | Stores values of various SQL Server-supported data types, except text, ntext, and timestamp. |
| Timestamp | Stores a database-wide unique number that gets updated every time a row gets updated |
| Uniqueidentifier | Stores a globally unique identifier (GUID) |
| Xml | Stores XML data. You can store xml instances in a column or a variable (SQL Server 2005 only). |
| cursor | Reference to a cursor object |
| table | Stores a result set for later processing |
PL SQL 