数据库ORACLE基本语句集锦
SELECT CHR(107) HAHA FROM DUAL;SELECT CURRENT_DATE FROM DUAL;
SELECT TRUNC(ABS(MONTHS_BETWEEN(DATE'1998-08-08',CURRENT_DATE)/12)) AGE FROM DUAL;
SELECT SNO AS 学号, SNAME 学生姓名 FROM STUDENT;
SELECT ALL SSEX FROM STUDENT;
SELECT DISTINCT SSEX FROM STUDENT;
SELECT UNIQUE SSEX FROM STUDENT;
SELECT * FROM SCORE WHERE GRADE < 60;
SELECT ROWID,ROWNUM,STUDENT.* FROM STUDENT;
SELECT * FROM STUDENT WHERE ROWNUM = 1;
SELECT * FROM STUDENT WHERE ROWNUM80;
SELECT SSEX,COUNT(SNO) FROM STUDENT GROUP BY SSEX;
SELECT SNO FROM SCORE WHERE CNO = 'C001' AND GRADE = (SELECT MAX(GRADE) FROM SCORE WHERE CNO = 'C001');
SELECT SNO FROM SCORE WHERE CNO = 'C001' AND GRADE >= ALL(SELECT GRADE FROM SCORE WHERE CNO = 'C001');
SELECT * FROM SCORE ORDER BY CNO ASC,GRADE DESC;
SELECT * FROM STUDENT,SCORE WHERE STUDENT.SNO = SCORE.SNO;
SELECT SNAME FROM STUDENT,SCORE
WHERE STUDENT.SNO = SCORE.SNO AND CNO = 'C001' AND GRADE = (SELECT MAX(GRADE) FROM SCORE WHERE CNO = 'C001');
SELECT * FROM STUDENT INNER JOIN SCORE ON STUDENT.SNO = SCORE.SNO;
SELECT * FROM STUDENT INNER JOIN SCORE USING(SNO);
SELECT * FROM STUDENT CROSS JOIN SCORE WHERE STUDENT.SNO = SCORE.SNO;
SELECT * FROM STUDENT NATURAL INNER JOIN SCORE;
SELECT * FROM STUDENT LEFT OUTER JOIN SCORE ON STUDENT.SNO = SCORE.SNO;
SELECT * FROM STUDENT RIGHT OUTER JOIN SCORE USING(SNO);
SELECT * FROM STUDENT FULL OUTER JOIN SCORE USING(SNO);
-- 查询考试不及格的学生姓名和挂科的科目名称
SELECT SNAME,CNAME
FROM (SCORE LEFT JOIN STUDENT USING(SNO))
LEFT JOIN COURSE USING(CNO)
WHERE GRADE < 60;
-- 查询所有java考试成绩高于平均分的学生的姓名和成绩
SELECT SNAME,GRADE
FROM (SCORE LEFT JOIN STUDENT USING(SNO))
LEFT JOIN COURSE USING(CNO)
WHERE CNAME = 'JAVA'
AND GRADE > (
SELECT AVG(GRADE) FROM SCORE LEFT JOIN COURSE USING(CNO)
WHERE CNAME = 'JAVA'
);
select * from (SELECT*from test RIGHT JOIN t_gradeusing(ID) )awhere `数学` > 90
-- 查询同时参加了C001和C002科目考试的学生编号
SELECT SNO FROM
(SELECT SNO,CNO FROM SCORE WHERE CNO = 'C001')
INNER JOIN
(SELECT SNO,CNO FROM SCORE WHERE CNO = 'C002')
USING(SNO);
-- 查询lili同学参加的所有科目考试中成绩最高的那门科目的授课老师名字
SELECT TNAME,CNAME FROM
TEACHER LEFT JOIN COURSE USING(TNO)
WHERE CNO IN (
SELECT CNO FROM
SCORE LEFT JOIN STUDENT USING(SNO)
WHERE SNAME = 'LILI'
AND GRADE = ( SELECT MAX(GRADE) FROM
SCORE LEFT JOIN STUDENT USING(SNO)
WHERE SNAME = 'LILI'
)
);
-- 查询库存目前还有多少
CREATE TABLE CLOTHER_STORE(
CTYPE VARCHAR2(10),
STORENUM NUMBER
);
CREATE TABLE CLOTHER_SALE(
CTYPE VARCHAR2(10),
SALENUM NUMBER
);
INSERT INTO CLOTHER_STORE VALUES('T-SHIRT',600);
INSERT INTO CLOTHER_STORE VALUES('COAT',700);
INSERT INTO CLOTHER_SALE VALUES('T-SHIRT',140);
INSERT INTO CLOTHER_SALE VALUES('T-SHIRT',165);
INSERT INTO CLOTHER_SALE VALUES('COAT',90);
INSERT INTO CLOTHER_SALE VALUES('COAT',78);
SELECT CTYPE,STORENUM-SNUM AS KCSY FROM
CLOTHER_STORE LEFT JOIN
(SELECT CTYPE,SUM(SALENUM) SNUM FROM CLOTHER_SALE GROUP BY CTYPE)
USING(CTYPE);
-- 切换到scott用户
SELECT * FROM EMP;
SELECT * FROM DEPT;
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