How to generate DDL of any object in ORACLE? SELECT DBMS_METADATA.get_ddl ( <OBJECT_TYPE>, <OBJECT_NAME>, <SCHEMA_NAME>) FROM DUAL;

How to reorder ORACLE table columns? Sample table CREATE TABLE TEST_COLUMN ( ID NUMBER, NAME VARCHAR2(200) CREATED_BY VARCHAR2(50) ); Add a column ALTER TABLE TEST_COLUMN ADD EMAIL VARCHAR2(50); Column Order will be ID NAME CREATED_BY EMAIL Reorder Email next to NAME. ALTER TABLE TEST_COLUMN MODIFY CREATED_BY …

How to find lock Object in ORACLE. SELECT a.osuser, a.sid, b.os_user_name, b.oracle_username, b.session_id, c.object_name, c.object_type FROM v$session a, v$locked_object b, dba_objects c WHERE a.sid = b.session_id AND b.object_id = c.object_id AND c.object_name = UPPER ('TABLE_NAME');

How to get Distinct/Unique record without using DISTINCT SQL/Oracle? Create table using following script: CREATE TABLE TEST_EMP ( ENAME VARCHAR2(10 BYTE), DEPTNO NUMBER(2), ID NUMBER ) Run following script for demo purpose. SET DEFINE OFF; Insert into TEST_EMP (ENAME, DEPTNO, ID) Values ('SMITH', 20, 1); …

How to save table images to oracle directory? Files from table to Oracle directory DECLARE l_file UTL_FILE.file_type; l_buffer RAW (32767); l_amount BINARY_INTEGER := 32767; l_position INTEGER := 1; l_blob_length INTEGER; BEGIN FOR l_cnt IN (SELECT filename, product_image FROM demo_product_info) LOOP l_file := …

Oracle NULLIF() Function: The Oracle NULLIF() function accepts only two arguments. If the both arguments are equal it returns a null value. In case the arguments are not equal, the NULLIF() function returns the first argument and if any arguments will null then function return an error. Syntax of the NULLIF() …

Oracle NVL2 Function: NVL2() function is an extend version of the NVL() function with different options based on whether a NULL value exists. Oracle NVL2() function allow three parameters. If the first parameter is not null, then it returns the second parameter. In case the second parameter is null, then it returns the …

Oracle Decode Function: Oracle DECODE() function compares the first argument with the second argument. IF they are equal, the function returns the third argument otherwise return default value. The Oracle/PLSQL DECODE function has the functionality of an IF-THEN-ELSE statement: SELECT DECODE (1, 1, 'ONE', …

Oracle NVL Function: The NVL function allow you to replace null values with a default value. If the first parameter is null, the function returns the second parameter. If the first parameter have some value then always return first value. Note := NVL function replaces null value with same type data. Syntax of the …

Oracle NULL-Related Functions. There are different type of null related function in oracle. NVL NVL function will check whether the first input parameter is null, if its null value, it returns the second parameter value. DECODE The Oracle/PLSQL DECODE function has the functionality of an IF-THEN-ELSE statement. * …

Coalesce in ORACLE COALESCE return first not null value out all the parameter passed into this function. NOTE: All the parameters have be same datatype DROP TABLE coalesce_func_test; CREATE TABLE coalesce_func_test ( id NUMBER, col1 VARCHAR2 (10), col2 VARCHAR2 (10), col3 VARCHAR2 (10), col4 NUMBER ); Sample Data SET …

Coalesce in ORACLE COALESCE return first not null value out all the parameter passed into this function. NOTE: All the parameters have be same datatype DROP TABLE coalesce_func_test; CREATE TABLE coalesce_func_test ( id NUMBER, col1 VARCHAR2 (10), col2 VARCHAR2 (10), col3 VARCHAR2 (10), col4 NUMBER ); Sample Data SET …

NULL in Oracle NULL = NULL ? SELECT CASE WHEN NULL = NULL THEN 'NULL Equals to NULL' ELSE 'NULL is NOT Equals to NULL' END NULL_ FROM DUAL; NULL_ NULL is NOT Equals to NULL COUNT with NULLs WITH tab AS (SELECT 10 a FROM DUAL UNION ALL SELECT NULL a FROM DUAL UNION ALL SELECT 2 a FROM DUAL) …

How to create Pipelined Functions in Oracle? Pipeline functions are used to return data in tabular format. It returns the data in the nested table type. Pipeline functions are useful to dump data derived from the complex queries. Create the types CREATE TYPE g_emp_row AS OBJECT ( empno NUMBER (4), ename VARCHAR2 (10 …

How to read Files from Oracle Directory using PL/SQL? File Structure ACCOUNTING RESEARCH SALES OPERATIONS 3 Records 5 Records 6 Records 0 Records How to generate files into Oracle Directory? DECLARE l_file UTL_FILE.file_type; l_read VARCHAR2 (32767); BEGIN l_file := UTL_FILE.fopen ('MY_DIR', …