[Oracle / MySQL] NULL 개념, 처리
ORACLE / MYSQL NULL 개념, 처리방법 -- MySQL 에서 NULL CREATE TABLE test_db.t1 (ID INT,C1 VARCHAR(10)); INSERT INTO test_db.t1 VALUES (1,1); INSERT INTO test_db.t1 VALUES (2,'2'); INSERT INTO test_db.t1 VALUES (3,NULL); INSERT INTO test_db.t1 VALUES (4,'4'); INSERT INTO test_db.t1 VALUES (5,''); INSERT INTO test_db.t1 VALUES (6,6); INSERT INTO test_db.t1 VALUES (7,' '); INSERT INTO test_db.t1 VALUES (8,'..
2022. 6. 11.