Why query optimization is needed?
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how instead of triger is helpful for mutating tables errors handlling ?
What is a table?
What is the purpose of the partition table?
What is the difference between CHAR and VARCHAR2? If VARCHAR2 serves the uses of CHAR why CHAR is still used and not been discarded yet?
Which version of sql do I have?
how to eliminate null values in a column i.e table vlaues 1 2 3 NULL 3 4 1 5 NULL i want output like this 1 2 3 3 4 1 5 i dnt want to use nvl is null and i dnt want replace the NULL value with any value i.e nvl(col,o);
What is database sql?
What is a unique key?
How many row comparison operators are used while working with a subquery?
What is the diff between Truncate table / delete <table name> purge
Is json a nosql?
why should required nested tables, Object types, partition tables and varying arrays. what is the difference between these are all. give me example with explanation.
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