给定下列两个表:()。
A: SELECT * FROM tab1 INNER JOIN tab2 ON col_1 = col_a
B: SELECT * FROM tab1 LEFT OUTER JOIN tab2 ON col_1 = col_a
C: SELECT * FROM tab1 RIGHT OUTER JOIN tab2 ON col_1 = col_a
D: SELECT * FROM tab1 FULL OUTER JOIN tab2 ON col_1 = col_a
A: SELECT * FROM tab1 INNER JOIN tab2 ON col_1 = col_a
B: SELECT * FROM tab1 LEFT OUTER JOIN tab2 ON col_1 = col_a
C: SELECT * FROM tab1 RIGHT OUTER JOIN tab2 ON col_1 = col_a
D: SELECT * FROM tab1 FULL OUTER JOIN tab2 ON col_1 = col_a
举一反三
- 给定下列表: 下列哪一个语句会产生所需结果?() A: SELECT UNIQUE * FROM tab1 B: SELECT DISTINCT * FROM tab1 C: SELECT UNIQUE(*) FROM tab1 D: SELECT DISTINCT(*) FROM tab1
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- 下面的语句按顺序成功执行后 CREATE TABLE tab1 (c1 CHAR(1))INSERT INTO tab1 VALUES ('b')CREATE VIEW view1 AS SELECT c1 FROM tab1 WHERE c1 ='a'INSERT INTO view1 VALUES ('a')INSERT INTO tab1 VALUES ('b')执行SELECT c1 FROM tab1可以选择出多少条记录?( ) A: 0 B: 1 C: 2 D: 3
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