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Each row in the TRANS_SUMMARY table contains details of one product. Each row in the TRANS_MONTHLY table contains transaction details either for new p 阅读全文
posted @ 2019-07-24 15:06
cnblogs_5359
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Examine these commands and their output: SQL> SELECT * FROM emp; ENO ENAME 100 Adam 101 Alan SQL> INSERT INTO emp VALUES(102,'Ben'); 1 row created. SQ 阅读全文
posted @ 2019-07-24 14:14
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USER1.EMP has a referential integrity constraint defined on EMP.DNO that references USER1.DEPT.DNO. USER1 executes these commands: SQL> UPDATE dept SE 阅读全文
posted @ 2019-07-24 13:27
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