IF OBJECT_ID('tempdb..#Students') IS NOT NULL
BEGIN
DROP TABLE #Students;
END
CREATE TABLE #Students
(
[Id] BIGINT NOT NULL,
[Name] VARCHAR(MAX) NOT NULL,
[Gender] VARCHAR(MAX) NULL,
)
INSERT INTO #Students VALUES(1,'Lucio','man')
INSERT INTO #Students VALUES(2,'Lisa','woman')
INSERT INTO #Students VALUES(3,'Michael','man')
INSERT INTO #Students VALUES(4,'Vic','man')
INSERT INTO #Students VALUES(5,'June','woman')
INSERT INTO #Students VALUES(6,'Lillian','woman')
INSERT INTO #Students VALUES(7,'Jane','woman')
INSERT INTO #Students VALUES(8,'Walter','man')
INSERT INTO #Students VALUES(9,'Jesse','man')
SELECT * FROM #Students
Id Name Gender
------- ------- --------
1 Lucio man
2 Lisa woman
3 Michael man
4 Vic man
5 June woman
6 Lillian woman
7 Jane woman
8 Walter man
9 Jesse man
IF OBJECT_ID('tempdb..#Scores') IS NOT NULL
BEGIN
DROP TABLE #Scores;
END
CREATE TABLE #Scores
(
[StudentId] BIGINT NOT NULL,
[Score] INT NOT NULL,
)
INSERT INTO #Scores VALUES(1,100)
INSERT INTO #Scores VALUES(2,60)
INSERT INTO #Scores VALUES(3,80)
INSERT INTO #Scores VALUES(4,80)
INSERT INTO #Scores VALUES(5,90)
INSERT INTO #Scores VALUES(6,80)
INSERT INTO #Scores VALUES(7,60)
INSERT INTO #Scores VALUES(8,80)
INSERT INTO #Scores VALUES(9,70)
SELECT * FROM #Scores
StudentId Score
--------------- --------
1 100
2 60
3 80
4 80
5 90
6 80
7 60
8 80
9 70
使用 IN 和 EXISTS
SELECT * FROM #Students WHERE Id IN (SELECT StudentId FROM #Scores WHERE Score >= 90)
SELECT * FROM #Students A WHERE EXISTS (SELECT * FROM #Scores B WHERE Score >= 90 AND A.Id = B.StudentId)
SELECT * FROM #Students A WHERE Id = ANY (SELECT StudentId FROM #Scores WHERE Score >= 90)
Id Name Gender
------- ------- -------
1 Lucio man
5 June woman