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What is DBMS and RDBMS?

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  What is DBMS and RDBMS? Ans- DBMS  stands for Database Management System, and RDBMS  is the acronym for the Relational Database Management system. In DBMS, the data is stored as a file, whereas in RDBMS, data is stored in the form of tables
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what is data, information and knowledge?

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what is data, information and knowledge? Ans-    Data:-  Data is collection of row facts without proper Meaning, Each row facts having meaning but when we read combinedly then no meaning.  Information:- Information is the result of re-ordered/ Re-processed of data.  Knowledge:- knowledge is the   recall the information. When we evaluate information is called information.
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Q-1-What is difference between drop and delete command? Q-2-what is difference between drop and truncate commands? Q-3-Why truncate is DDL command? Q-4- What is select commands?

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 Q-1- What is difference between drop and delete command?   Drop command Delete command 1-Drop command belong to DDL. 2- Drop commands delete both header and table permanently. 3-Drop commands does not support where conditions.   Syntax: Drop table<Table_Name>;   1-Delete command belongs to DML 2-Delete commands delete the data / body part of the table. 3-Delete support where conditions. Syntax: Delete from<table_name> where <conditions>;       Q-2- what is difference between drop and truncate commands? Drop commands Truncate commands 1-Drop command belong to DDL. 2- Drop commands delete both header and table permanently. 3-Drop commands does not support where conditions.   Syntax: Drop table<Table_Name>;   1-Truncate commands belong to DDL. 2-Truncate command will delete both header and body of the table and re-create the header. 3-Truncate does not support where conditions.   Syntax: Truncate table<Table_name...
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