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3.1 SQL

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3.2 SQL

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CREATE TABLE TAB1

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SQL

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[5] “”StudentSnoSnameSsexSageSdept


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);

SQL

CREATE TABLE SC
);

SQL

SQL

SQL

SQL

ALTER TABLE Student ADD Scome DATE

[9]

[10]

SQL
RESTRICT:
CASCADE

SQL

SQL
ON <>(<>[<>][,<>[<>] ]…)
<>
UNIQUE
CLUSTER

SQL

[13]
CREATE UNIQUE INDEX SCno ON SC(Sno ASCCno DESC)

UNIQUE

SQL

StudentSnameStudentSname

SQL

SQL
SELECT
FROM()
WHERE
HAVING

SQL
-
Student
Course
SC
Course(CnoCnameCpnoCcredit)
SC(SnoCnoGrade)

SQL
[2]
2.
FROM Student

SQL
3.

Sname
2006-Sage

1986

1987

1988

1987

SQL
ISLOWER(Sdept)

SQL
ISLOWER(Sdept) DEPARTMENT
FROM Student

SQL
FROM SC;

SQL
2.
WHERE

SQL

SQL
SELECT SnameSdeptSage
[11] 20~23
SELECT SnameSdeptSage
An Introduction to Database System

SQL
<>
SELECT SnameSsex
SELECT SnameSsex

SQL
<>

% () 0
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SQL
1)
[14] 200215121

SQL

SQL
[19] DB_Design
[20] "DB_"3 i
An Introduction to Database System

SQL
“IS NULL” “= NULL”
[21]
SELECT SnoCno FROM SC
WHERE Grade IS NULL

SQL
An Introduction to Database System

SQL
SELECT SnameSsex
An Introduction to Database System

SQL
SELECT SnameSdeptSage

An Introduction to Database System

SQL

Sno
Grade
200215126
200215129
200215121
92
200215123
90
200215125
88
200215132
85
200215131
60

SQL

SQL

SQL
An Introduction to Database System

SQL

SQL
HAVING

SQL
=><>=<=!=
:
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SQL

(NESTED-LOOP)
2121
1

SQL

SQL

FROM StudentSC
WHERE Student.Sno = SC.Sno

SQL

SQL
WHERE FIRST.Cpno = SECOND.Cno

SQL
——FULL JOIN ON
FROM Student LEFT OUT JOIN SC ON (Student.SNO=SC.SNO)
FROM Student LEFT OUT JOIN SC USINGSno;


SQL
SC.Cno= ‘ 2 ’ AND /* */

SQL
FROM StudentSCCourse

SQL

SQL






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SQL

SQL

SQL

WHERE S1.Sdept = S2.Sdept AND

SQL
FROM Student SnoSname
WHERE Sno IN
WHERE Cname= ‘’));

SQL
SELECT SnoSnameSdept

SQL

SQL

SQL

SQL
FROM Student

SQL
ANYALL
ANYALL

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SQL



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3.
SELECT SnoSnameSdept

SQL

SQL


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≡ (y (( p∨ q)

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SELECT *

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An Introduction to Database System

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SQL
(SELECT Sno
FROM SC

SQL

SQL
[<2’> [ASC|DESC] ] … ]

SQL
<>+-*/

SQL
(SELECT) (SELECT)

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(6) [NOT] EXISTS (SELECT)

SQL
3.5.1

SQL
3.5.1

VALUES (<1> [<2>] … )

SQL
VALUES (‘ 200215126 ’‘'''18‘CS')
[1] :200215128IS18Student
INSERT

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[WHERE <>]
WHERE

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WHERE

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DBMS




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ORDER BY DISTINCT
An Introduction to Database System

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:
SELECT
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AS

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AS

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AS

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AS SELECT *
FROM Student
AS
FROM Student

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An Introduction to Database System

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SC.Cno= '1'

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AS

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An Introduction to Database System

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VALUES(‘200215129'''20'IS' )

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An Introduction to Database System

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AS

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DB2
(3)

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SQL

SQL

“”
AS
FROM SXSY
WHERE SX.Sno=SY.Sno

SQL

FROM SC
An Introduction to Database System