A collateral contract is one where the parties to one contract enter into or promise to enter into another contract. Thus, the two contracts are connected and it maybe enforced even though it forms no constructive part of the original contract.or example, a collateral contract is formed when one party pays the other party a certain sum for entry into another contract. A collateral contract may be between one of the parties and a third party.
Using Large-Value Data Types. The max specifier expands the storage capabilities of the varchar, nvarchar, and varbinary data types. varchar(max), nvarchar(max), and varbinary(max) are collectively called large-value data types. You can use the large-value data types to store up to 2^31-1 bytes of data.
varchar2 is varable length if you want to insert a name in a table you define a varchar2(50) char your insert a name only 5 char your table space is not waist your table space will be free but you define a varchar your space. will not free store a your name and blank space is store.