Introduction SQL stands for ‘Structured Query Language’. SQL is pronounced as ‘Sequel’. SQL statements are like simple English imperative sentence. Features SQL is a query language used to retrieve and manipulate data in various ways as per need of the programmer in a RDBMS. There are 5 common operations performed by the Read more…
Currently Used SQL Keywords NB : SQL Keywords can be used as Identifiers in our query by putting them inside big bracket such as [ADD], [PERCENT], [ALL] etc. ADD EXCEPT PERCENT ALL EXEC PLAN ALTER EXECUTE PRECISION Read more…
Example : How to Export Oracle 10g/11g Database file or How to create dump(.dmp) file in Oracle10g/11g . Example : How to Export selected tables in Oracle10g/11g Database file as dump(.dmp) file. Example : How to Import dump(.dmp) file into Oracle 10g/11g.
Alter Table Statement Definition : Alter Table statement is used to change the structure of an existing table of a database i.e. this statement specifies how to add one or multiple new columns/fields/attributes, modify one or more existing columns/fields/attributes , drop or delete the existing columns from a table, rename Read more…
Definition : This statement is used to modify/change/update the existing record/s or data in the database. Syntax : UPDATE table–name SET(column–name1=value1, column–name2 =value2, column–name3=value3, column–name4=value4, column–name5=value5 ) ; Example : UPDATE employee SET(emp_id=”125M”, emp_name=”Rahman”, emp_addr =”Kolkata”, emp_dept=”Manager”, emp_dob=”05/22/2020″, emp_sal=20500, emp_mob=9334582186); UPDATE employee SET(emp_name=”Rahman”, emp_addr =”Kolkata”, emp_dept=”Manager”, emp_dob=”05/22/2020″, emp_sal=20500, emp_mob=9334582186 where emp_id= “105M”);
Definition : This statement is used to remove one or more records permanently from the database table. Syntax : DELETE table-name; DELETE table-name where condition; Example : Problem : How to remove all data/records from a table permanently. SQL> Delete from employee; SQL> Delete * from employee; Problem : How Read more…
SELECT STATEMENT Basic Select Syntax : SELECT column_name1,column_name2… column_name_n FROM table-name[WHERE Clause][GROUP BY clause][HAVING clause][ORDER BY clause]; The SELECT query statement is used to retrieve stored data from a database in the form of table-like structure called result set. It is one of the largest use query/statement. Example : How Read more…
Definition : Insert into statement is used to add new or fresh record/s into an existing database table. Syntax : INSERT INTO table-name (field or attribute or column-name1, column-name2, column-name3, column-name4, column-name5) VALUES (value1, value2, value3, value4, value5 );(Press Enter) Example : For more Select query use this link
Create Table Definition : This statement is used to create new/fresh table with various column or fields name and respective datatype in a database. Syntax : CREATE TABLE schema_name.table_name (column_name1 data_type1 column_constraint1, column_name2 data_type2 column_constraint2, . . . table_constraints ); CREATE TABLE table_name ( column_name1 data_type1 column_constraint1, column_name2 data_type2 Read more…
Click this link to know How to Uninstall Oracle 10g from Window 7/8.1/10. Example : How to start/open oracle 10g from C-Command prompt/in MS-DOS ? Example : How to back at C-Command prompt/in MS-DOS from Oracle 10g SQL prompt ? Example : How to find SID name Read more…