Explain 'Sequential Codes' and 'Block Codes' with the help of an example.

Sequential codes: Meaning: Numbers and /or letters are assigned in consecutive order. These codes are applied primarily to source documents such as cheque, invoices etc. This code can facilitate searches. This process enables in either identification of missing codes relating to a particular document, or a relevant document can be traced on the basis of code. For example, A creditor Rohit Ltd can be given a code CL $\displaystyle 001$-Rohit Ltd. Similarly, for Ms. Raj CL $\displaystyle 002$- Ms. Raj Block codes: Meaning: A range of numbers is partitioned into a desired number of sub ranges and each subrange is allotted to a specific group. In most of the uses of block codes, numbers within a subrange follow sequential coding scheme. For example, Codes Dealer type $\displaystyle 100$-$\displaystyle 199$ Small pump $\displaystyle 200$-$\displaystyle 299$ Medium pump $\displaystyle 300$-$\displaystyle 399$ Pipes Or any other suitable example.