Flat file databases though easier to maintain, are far less robust and flexible.A Database Management System (DBMS) is a program which manages data in databases, the manner in which data is created, stored, modified and accessed.A Relational Database Management System (RDBMS) is the DBMS in respect of a relational database.

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The multiple tables relate to and work with each other through certain key fields (like unique "ID Nos") viz.

a separate table is created for vendor-details and another table for purchase-orders wherein vendor details are not repeated each time a purchase order is made and they are related with each other through a unique "Vendor ID" column which is present in both tables.

Whereas flat file databases contain a single table of data with fields representing all parameters viz.

a single table will contain details of vendors and purchase orders made, and with each purchase order the vendor details also get repeated resulting in duplication.

Microsoft Access: Active X Data Objects Library (ADO). Microsoft Access: Use ADO to Execute SQL statements. Import or Export Data from Access to Excel using ADO. Microsoft Access: Active X Data Objects Extensions (ADOX).

--------------- SQL Commands explained Using the ADO connection Execute method to execute the specified query and SQL statements Use the Open Schema Method to access information about database tables and columns Create a database table using ADO, with SQL statements ADO Find Method - Find or Locate a specific Record ADO Filter Property to Filter Records ------------------------------------------------------------------------------------------------------------------------------------ You can use ADO to execute SQL commands to manipulate data and manage your database.Using SQL requires that the data should be entered as per the table structure, the columns sequence and their data type.SQL, stands for Structured Query Language, is a computer language, and SQL statements are used to store, retrieve and manipulate data in a relational database ex. A relational database has multiple tables, each table comprising of columns (fields) and rows wherein data can be grouped using common attributes, and from which data can be easily retrieved.Other examples of DBMS are My SQL, Microsoft SQL Server, Oracle, etc. DDL (stands for Data Definition Language) statements are used to make structural changes, to define the database structure and objects like tables and columns.Examples of some often used DDL commands are CREATE TABLE, DROP TABLE and ALTER TABLE.DML statements are used to managing and manipulating data within the database structure and deal with inserting, updating, deleteing and retrieving database information like records in tables.