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Matrix Equation Problem link https://ac.nowcoder.com/acm/contest/21858/A Solution Since \(A \times B = B \odot C\),then any column of these two matric 阅读全文
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DATABASE TEST9 1 CREATE TABLE test9_01 AS SELECT * FROM pub.student_11_1 DELETE FROM test9_01 CREATE INDEX id_index ON test9_01(sid) INSERT INTO test9 阅读全文
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DATABASE TEST8 test8-1 #subwindow CREATE TABLE test8_00 AS SELECT * FROM pub.teacher GRANT ALL ON test8_00 to user202000130088 GRANT select on test8_0 阅读全文
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DATABASE TEST7 BASIC OPERATIONS CREATE INDEX index_name ON table_name(column_name) DROP INDEX index_name 7-1 CREATE TABLE test7_01 AS SELECT sid,name, 阅读全文
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DATABASE TEST6 6-1 CREATE VIEW test6_01 AS SELECT sid,name,age,dname FROM pub.student WHERE age < 20 AND dname = '物理学院' ORDER BY sid 6-2 CREATE TABLE 阅读全文