Question: 1. Explain the problems that may occur when the DBMS does not support the concept of null. 2. What does it mean that a catalog

1. Explain the problems that may occur when the DBMS does not support the concept of null.

2. What does it mean that a catalog is self-describing? What does the following statement mean? (( TABLES JOIN COLUMNS ) WHERE COLCOUNT < 3 ) [TABNAME, COLNAME]

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