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Ask the Experts
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Multiple instances on a single database
Is it possible for Oracle to have parallel servers (single database, multiple instances)? Is it impossible to have the inverse (that is, multiple databases, single instance)? Continue Reading
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VARCHAR2 vs. NUMBER
What is the correct circumstance to store a numeric string as VARCHAR2 vs. NUMBER? The response I have received before is to store all numeric strings as VARCHAR2 unless the intention is to manipulate the field mathematically; but no reason has ... Continue Reading
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Alternative to LEFT OUTER JOIN?
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How do I copy an Oracle DB from one server to another?
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Assertions
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Purpose of roll forward and roll backward
What are rolling forward and rolling backward in backup and recovery? Continue Reading
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ORA-12801 and ORA-01652 errors on running query
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PL/SQL to display all tables
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Telling EXECUTE IMMEDIATE to commit
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DIRECT=Y versus DIRECT=N when importing
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How to validate zip code, city, and state code
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Inserting the '&' symbol in a string
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FIRST N rows, TOP N rows, LAST N rows, BOTTOM N rows...
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COALESCE on three columns
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Age constraint on a date column
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Getting a row number in a group
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What does SELECT 1 accomplish?
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Closest date before or after a given date
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Checking if row is locked before using it in a procedure
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Assignment operators explained
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How can I use INSERT INTO to copy an entire table into another?