Introduction to Database System Which command(s) is(are) used to enable/disable/drop an integrity constraint in SQL? All of the listed here DEFINE TABLE MODIFY TABLE ALTER TABLE All of the listed here DEFINE TABLE MODIFY TABLE ALTER TABLE ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System A form defines both of the listed here where data is placed on the screen none of the listed here the width of each field both of the listed here where data is placed on the screen none of the listed here the width of each field ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System A primary key is a composite key that was selected to be the main identifier for the relation. True False True False ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System Two files may be joined into a third file if both (b) and (c) they have no records with the same value in the common field they have a field in common they have a row in common None of these both (b) and (c) they have no records with the same value in the common field they have a field in common they have a row in common None of these ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System To have a file hold a list, it is necessary to decide which fields will be used as sort or index keys All of the listed here identify the name, width and type of the fields of each record. identify the records in the list decide which fields will be used as sort or index keys All of the listed here identify the name, width and type of the fields of each record. identify the records in the list ANSWER DOWNLOAD EXAMIANS APP
Introduction to Database System In the relational model, relationships between relations or tables are created by using: determinants. composite keys. candidate keys. foreign keys. determinants. composite keys. candidate keys. foreign keys. ANSWER DOWNLOAD EXAMIANS APP
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