DATABASE CONCEPTS AND PRACTICAL EXAMPLES
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This document discusses various SQL commands used to manage databases and tables. It describes commands to create and delete databases and tables, insert, update, and delete records from tables. It also covers displaying the structure of tables, modifying the structure of tables using ALTER TABLE, and using SELECT statements to view data.
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DATABASE CONCEPTS AND PRACTICAL EXAMPLES
- 1. SQL Commands Create a database: Open a database: Delete a database
- 2. Create table Command It is used to create a table in a database E.g
- 3. Insert a Record Insert command is used to insert a record Insert a row in table Insert null values in the table Insert values in particular column
- 4. Display structure of table Describe <table name> or desc <tablename>
- 5. Update Command It is used to change the record of the table. You can change all the rows or particular row from the table. The Update command specifies the row with where clause and new data is written into respective record using set keyword. E.g Student table before change
- 6. Various way of Updating records Change a particular value Updating multiple records Updating Null value Updating using expression
- 8. Delete Records There are two commands to delete records: Delete Truncate Delete:it is used to delete all rows or particular row from the table using where clause. Truncate: to delete al the row from table and free the space for containing the table Drop Table: This command is used to physically delete the table i.e. remove structure also. E.g. of delete E.g. of truncate E.g. Drop table
- 9. Modify the Structure of Table Alter Table command is used to modify the structure of table by modifying the column definition of its column. It perform following operations: To add new column in table To rename column To change data type or modify size To remove a column physically
- 10. Structure after Modification Before Modification After Modification