The below sequence will start with 1 and increment by 1.  There is no MAXVALUE defined so the sequence’s max value will default to 999999999999999999999999999.  The CACHE is set to 50 so it will cache up to 50 values to help with performance.

CREATE SEQUENCE SOME_SEQUENCE
MINVALUE 1
START WITH 1
INCREMENT BY 1
CACHE 50;

To use the above sequence, you can use the <sequence name>.nextval in a statement.

Example:
insert into temp (some_number) values (some_sequence.nextval);

CREATE OR REPLACE FUNCTION ADD_COLUMN_FUNCTION
RETURN INTEGER
IS

temp_String varchar2(200);
temp_Table_Name varchar2(30);

CURSOR cursor_User_Tables IS
SELECT TABLE_NAME
FROM USER_TABLES;

BEGIN

FOR rec IN cursor_User_Tables
LOOP

temp_Table_Name := rec.TABLE_NAME;

temp_String := ‘ALTER TABLE ‘ || temp_Table_Name || ‘ ADD SOME_NEW_COLUMN NUMBER’;

EXECUTE IMMEDIATE temp_String;

END LOOP;

RETURN 1;

END;
/

You can execute the above function by running the following.

DECLARE
X NUMBER;
BEGIN
X := ADD_COLUMN_FUNCTION;
END;
/

If you wanted the function to add the column to a single table, your function would look like this.

CREATE OR REPLACE FUNCTION ADD_COLUMN_FUNCTION_2 (var_Table_Name VARCHAR2)
RETURN INTEGER
IS

temp_String varchar2(200);

BEGIN

temp_String := ‘ALTER TABLE ‘ || var_Table_Name || ‘ ADD SOME_NEW_COLUMN_2 NUMBER’;

EXECUTE IMMEDIATE temp_String;

RETURN 1;

END;
/

You can execute the above function by running the following where TEMP2 is the table name we are adding the column to.

DECLARE
X NUMBER;
BEGIN
X := ADD_COLUMN_FUNCTION_2(‘TEMP2′);
END;
/

CREATE OR REPLACE PROCEDURE ADD_COLUMN_STORED_PROCEDURE IS

temp_String varchar2(200);
temp_Table_Name varchar2(30);

CURSOR cursor_User_Tables IS
SELECT TABLE_NAME
FROM USER_TABLES;

BEGIN

FOR rec IN cursor_User_Tables
LOOP

temp_Table_Name := rec.TABLE_NAME;

temp_String := ‘ALTER TABLE ‘ || temp_Table_Name || ‘ ADD SOME_NEW_COLUMN NUMBER’;

EXECUTE IMMEDIATE temp_String;

END LOOP;

END;
/

If you wanted the stored procedure to add the column to a single table, your stored procedure would look like this.

CREATE OR REPLACE PROCEDURE ADD_COLUMN_STORED_PROCEDURE_2 (var_Table_Name VARCHAR2) IS

temp_String varchar2(200);

BEGIN

temp_String := ‘ALTER TABLE ‘ || var_Table_Name || ‘ ADD SOME_NEW_COLUMN_2  NUMBER’;

EXECUTE IMMEDIATE temp_String;

END;
/

UPDATE OPB_WIDGET_FIELD
SET wgt_prec = 19, wgt_datatype = -5
WHERE  field_name IN ( ‘CURRVAL’,'NEXTVAL’)
AND wgt_datatype = 4;

ALTER TABLE SAMPLE_TABLE ADD  ANOTHER_DATE DATE;

Here is the statement to add multiple columns to a table.

ALTER TABLE SAMPLE_TABLE ADD (
ANOTHER_STRING VARCHAR2(100 CHAR),
ANOTHER_NUMBER NUMBER(32,12)
);

ANALYZE TABLE SAMPLE_TABLE COMPUTE STATISTICS;  –completely computes statistics
ANALYZE INDEX SAMPLE_TABLE_PK COMPUTE STATISTICS; –completely computes statistics

ANALYZE TABLE SAMPLE_TABLE ESTIMATE STATISTICS SAMPLE 100 ROWS; –estimates statistics based on the set number of rows
ANALYZE TABLE SAMPLE_TABLE ESTIMATE STATISTICS SAMPLE 15 PERCENT; –estimates statistics based on the set percentage of rows

TRUNCATE TABLE SAMPLE_TABLE;

DELETE FROM SAMPLE_TABLE;
COMMIT;

Here is an example of how to delete data from a table by using a filter. 

DELETE FROM SAMPLE_TABLE WHERE SOME_NUMBER = 20;
COMMIT;

ALTER TABLESPACE ”SAMPLEDATAFILE” ADD DATAFILE ‘/u01/oracle/some_folder.dbf’ size 2048M;

CREATE TABLE SAMPLE_TABLE_COPY AS SELECT * FROM SAMPLE_TABLE;

Here is how to create a backup of an existing table (without data).

CREATE TABLE SAMPLE_TABLE_COPY AS SELECT * FROM SAMPLE_TABLE WHERE ROWNUM < 1;