truncate and alter mysql

1. Alter and Truncate
Table
Presented by
Manohar Bhasin
Rishi Singh

2. CONTENT
Truncate Table
2
Alter Table
Adding a new column
Modifying a column
Dropping a column

3. 1.
Truncate
Table

4. “
Truncate Table statement is used to
remove all records from a table. It is a
DDL statement.
4

5. Syntax
5
Truncate Table [schemaName.]tableName;
Parameters
1. schemaName: specifies the name of the schema that the
table belongs to.
2. tableName: It specifies the table that you want to
truncate.

6. 2.
Alter Table

7. “
Alter Table statement is used to add
modify or drop columns. It is a DDL
statement
7

8. Syntax
8
Alter Table ADD (columnName columntype);
Parameters
1. columnName: specifies the name of the new Column.
2. columnType: It specifies the datatype of the new table.
Adding a new Column

9. Syntax
9
Alter Table tableName MODIFY (columnName
columntype);
Parameters
1. columnName: specifies the name of the Column.
2. columnType: It specifies the datatype of the Column.
3. tableName: It specifies the name of the Table.
Modifying a Column

10. Syntax
10
Alter Table tablename DROP(columnName
columntype);
Parameters
1. columnName: specifies the name of the new Column.
2. columnType: It specifies the datatype of the new table.
Dropping a Column

11. Thank You