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发布时间:2019-11-11 10:10:01

Which three statements are true about defining relations between tables in a relatonal database?B) Unique key columns allow null valuesD) Every primary or unique key value must refer to a matching foreign key value.Answer:ABE......【阅读全文】

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发布时间:2019-11-06 10:08:36

Which three statements are true about GLOBAL TEMPORARY TABLES?B) A GLOBAL TEMPORARY TABLE can have multiple indexesD) Data Manipulation Language (DML) on GLOBAL TEMPORARY TABLES generates no REDO.F) A tigger can be created on a GLOBAL TEMPORARY TABLE(解析:全局临时表跟普通表一样,.........【阅读全文】

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发布时间:2019-11-06 09:38:11

Which two statements are true about transactions in the Oracle Database serve?B) Data Manipulation Language (DML) statements always start a new transaction.D) A Data Detiniton Language (DDL) statement does a commit automatially only for the data dictionary updates caused by the DDLF) I.........【阅读全文】

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发布时间:2019-11-04 10:49:06

Which two statements are true about transactions in the Oracle Database serve?B) Data Manipulation Language (DML) statements always start a new transaction.D) A Data Detiniton Language (DDL) statement does a commit automatially only for the data dictionary updates caused by the DDLF) I.........【阅读全文】

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发布时间:2019-11-04 10:18:09

In the PROMOTIONS table, the PROMO_BEGTN_DATE columm is of datatype DATE and the default date format is DD-MON-RR.A) TO_NUMBER(PROMO_ BEGIN_DATE) - 5 will return numberC) PROMO_BEGIN_DATE - SYSDATE will return a number.E) PROMO_BEGIN_DATE - SYSDATE will return an error.(解析:这道.........【阅读全文】

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