What does new grouping sets enables you to do?
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Explain various types of locks in a transaction? Which is better and why?
can i use the commands "modify" and Change in DB2 to alter my column datatype and its name in a table?
what is primary key,unique key, foreign key? can u teach me in simple language?
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How default key is different from primary key?
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Explain inner and outer joins with examples.
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what is data set ?
Can a database table exist without a primary key?
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