diff --git a/subquery.sql b/subquery.sql
new file mode 100644
index 0000000..ce8ae76
--- /dev/null
+++ b/subquery.sql
@@ -0,0 +1,49 @@
+USE Study
+GO
+
+SELECT DNAME
+FROM DEPARTMENT
+WHERE DEPARTMENT.DNO = (SELECT DNO
+						FROM EMPLOYEE
+						WHERE EMPLOYEE.ENO = 103)
+
+-- À§ Äõ¸®¿Í µ¿ÀÏ
+SELECT DNAME
+FROM DEPARTMENT
+	JOIN EMPLOYEE ON EMPLOYEE.DNO = DEPARTMENT.DNO
+WHERE EMPLOYEE.ENO = 103
+
+
+-- ´ÜÀÏÇà ¼­ºêÄõ¸®
+SELECT ENO,DNO
+FROM EMPLOYEE
+WHERE EMPLOYEE.DNO = (SELECT DNO FROM EMPLOYEE WHERE EMPLOYEE.ENO = 110)
+
+-- ´ÙÁßÇà ¼­ºêÄõ¸®
+SELECT ENAME, ENO,DNO, SALARY
+FROM EMPLOYEE
+WHERE EMPLOYEE.DNO IN (SELECT DNO FROM EMPLOYEE WHERE SALARY >= 500)
+
+SELECT ENAME, ENO,DNO, SALARY
+FROM EMPLOYEE
+WHERE SALARY >= ANY (SELECT SALARY FROM EMPLOYEE WHERE DNO = 20)
+
+SELECT ENAME, ENO,DNO, SALARY
+FROM EMPLOYEE
+WHERE SALARY >= ALL (SELECT SALARY FROM EMPLOYEE WHERE DNO = 10)
+
+SELECT ENAME
+FROM EMPLOYEE
+WHERE EXISTS (SELECT * FROM EMPLOYEE WHERE SALARY + COMMISSION > 500)
+
+SELECT ENO, ENAME, DNO, SALARY
+FROM EMPLOYEE
+WHERE DNO IN (SELECT DNO FROM EMPLOYEE WHERE ENO = 101)
+	AND SALARY IN (SELECT SALARY FROM EMPLOYEE WHERE ENO = 101)
+
+
+-- »óÈ£ ¿¬°ü ¼­ºêÄõ¸®: ÀϹÝÀûÀ¸·Î ¼º´ÉÀÌ ¶³¾îÁö¸ç, Á¶ÀÎÀ» ¾²´Â°Ô ÁÁÀ½
+-- (¸ÞÀÎ Äõ¸®¿¡ µû¶ó ¼­ºêÄõ¸® °á°ú°¡ ´Þ¶óÁö´Â »óÈ£ ¿¬°üµÈ ¼­ºêÄõ¸®´Â ºó¹øÇÑ Á¶È¸¸¦ À¯¹ß)
+SELECT ENO, ENAME, SALARY, DNO
+FROM EMPLOYEE AS E
+WHERE DNO IN (SELECT DNO FROM EMPLOYEE AS M WHERE E.MANAGER = M.ENO)
\ No newline at end of file