This document provides an overview of common Oracle PL/SQL commands and concepts for working with tables, views, users, indexes, sequences, synonyms, roles, functions, procedures, triggers, collections, implicit and explicit cursors, data types, and the data dictionary. It includes commands for creating, altering, dropping and managing database objects as well as SQL statements for queries, DML, joins and collections.

1. Learn Oracle PL/SQL
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Create table
CREATE TABLE table_name (column_name datatype, column_name datatype);
CREATE TABLE table_name AS SELECT * FROM table_name2;
Drop table
DROP TABLE table_name;
Create view
CREATE VIEW view_name AS SELECT * FROM table_name;
Drop view
DROP VIEW view_name;
Create user
CREATE USER user_name IDENTIFIED BY user_password ;
Drop user
DROP USER user_name;
Create index
CREATE INDEX index_name ON table_name (column_name);
Drop index
DROP INDEX index_name;
Create sequence
CREATE SEQUENCE seq_name START WITH 1 INCREMENT BY 1 NOCACHE NOCYCLE;
Drop sequence
DROP SEQUENCE sequence_name;
Create synonym
CREATE [PUBLIC] SYNONYM synonym_name FOR object;
Drop synonym
DROP [ PUBLIC ] SYNONYM synonym_name;
Create role
CREATE ROLE role_name;

2. Drop role
DROP ROLE role_name;
Create function
CREATE OR REPLACE FUNCTION function_name
RETURN number AS
BEGIN
RETURN 1;
END;
Create function with parameter
CREATE OR REPLACE FUNCTION function_name(p_parameter varchar2)
RETURN varchar2 AS
BEGIN
RETURN p_parameter;
END;
Drop function
DROP FUNCTION function_name;
Create procedure
CREATE OR REPLACE PROCEDURE procedure_name
AS
BEGIN
DBMS_OUTPUT.PUT_LINE('Test');
END;
Create procedure with parameter
CREATE OR REPLACE PROCEDURE procedure_name (p_parameter number)
IS
BEGIN
DBMS_OUTPUT.PUT_LINE(p_parameter);
END;
Drop procedure
DROP PROCEDURE procedure_name;
Create trigger
CREATE OR REPLACE TRIGGER trigger_name
{BEFORE | AFTER | INSTEAD OF}
{INSERT | UPDATE | DELETE}
[OF column_name]
ON table_name [REFERENCING OLD AS old NEW AS new]
[FOR EACH ROW]
WHEN condition
DECLARE
-- declare statements
BEGIN
-- sql statements
-- pl/sql statements
END;

3. Drop trigger
DROP trigger trigger_name;
Alter trigger
ALTER TRIGGER trigger_name COMPILE;
ALTER TRIGGER trigger_name RENAME TO new_trigger_name;
ALTER TRIGGER trigger_name ENABLE;
ALTER TABLE table_name ENABLE ALL TRIGGERS;
ALTER TRIGGER trigger_name DISABLE;
ALTER TABLE table_name DISABLE ALL TRIGGERS;
Add primary key
ALTER TABLE table_name ADD CONSTRAINT constraint_name PRIMARY KEY(coll_name);
Add constraint foreign key
ALTER TABLE table1 ADD CONSTRAINT constraint_name
FOREIGN KEY (coll_name) REFERENCES table2(coll_name);
Drop constraint key
ALTER TABLE table_name DROP CONSTRAINT constraint_name;
Enable a foreign key
ALTER TABLE table_name ENABLE CONSTRAINT constraint_name;
Disable foreign key
ALTER TABLE table_name DISABLE CONSTRAINT constraint_name;
Insert
INSERT INTO table_name VALUES (value1, value2, ...);
INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, ...);
INSERT INTO table1 (column1, column2) SELECT column1, column2 FROM table2;
Insert All
INSERT ALL
INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, ...)
INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, ...)
INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, ...)
SELECT * FROM dual;
Update
UPDATE table_name SET column_name = value;

4. UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition;
Delete
DELETE FROM table_name;
DELETE FROM table_name WHERE condition;
Cartesian Products
SELECT * FROM table1, table2;
Inner Join
SELECT * FROM table1, table2 WHERE table1.id=table2.id;
Left Join
SELECT * FROM table1 LEFT JOIN table2 ON table1.id=table2.id;
Right Join
SELECT * FROM table1 RIGHT JOIN table2 ON table1.id=table2.id;
Self Join
SELECT * FROM table1 a, table1 b WHERE a.id=b.id;
Full Join
SELECT * FROM table1 FULL JOIN table2 ON table1.id=table2.id;
Full Outer Join
SELECT * FROM table1 FULL OUTER JOIN table2 ON table1.id=table2.id;
Any
SELECT * FROM table_name WHERE column_name = ANY (value1, value2);
Between
SELECT * FROM table_name WHERE column_name BETWEEN value1 AND value2;
Exists
SELECT * FROM table1 WHERE EXISTS (SELECT * FROM table2);
Not Exists
SELECT * FROM table1 WHERE NOT EXISTS (SELECT * FROM table2);
Group By
SELECT group_function(col1), col2 FROM table_name GROUP BY col2;
IN
SELECT * FROM table_name WHERE column_name IN (value1, value2);

5. Like
SELECT * FROM table_name WHERE column_name LIKE '%expr%';
Order By
SELECT * FROM table_name ORDER BY column_name;
Where
SELECT * FROM table_name WHERE column_name=value;
The main datatypes:
VARCHAR2
NUMBER
DATE
CHAR
PLS_INTEGER
BOOLEAN
BLOB
CLOB
Implicit Cursor
Attributes
%BULK_ROWCOUNT
%BULK_EXCEPTIONS
%ISOPEN
%FOUND
%NOTFOUND
%ROWCOUNT
Explicit Cursor
DECLARE
CURSOR c1 IS SELECT * FROM table_name;
v_var c1%ROWTYPE;
BEGIN
OPEN c1;
LOOP
FETCH c1 INTO v_var;
EXIT WHEN c1%NOTFOUND;
END LOOP;
CLOSE c1;
END;
Collection types
Index-by tables(associative arrays)
Nested tables
Varrays(variable-size arrays)
Collection Methods
EXISTS
COUNT
LIMIT
FIRST

6. LAST
PRIOR
NEXT
EXTEND
TRIM
DELETE
Collection Exceptions
COLLECTION_IS_NULL
NO_DATA_FOUND
SUBSCRIPT_BEYOND_COUNT
SUBSCRIPT_OUTSIDE_LIMIT
VALUE_ERROR
Types of records
Table-based
Cursor-based
User-defined
Data Dictionary
USER_ALL_TABLES
USER_OBJECTS
USER_TABLES
USER_CONSTRAINTS
USER_INDEXES
USER_PROCEDURES
USER_TRIGGERS
ALL_ALL_TABLES
ALL_OBJECTS
ALL_TABLES
ALL_CONSTRAINTS
ALL_INDEXES
ALL_PROCEDURES
ALL_TRIGGERS
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