Ask the Experts
Ask the Experts
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Trying to remove datafiles from tablespace
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Grouping schemas functionally
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Storing and retrieving video clips
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Implementing a data warehouse: Outsource or in-house with consultants?
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Closing ref cursor after it's used in a Java program
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Caching and pinning revisited
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Exporting data using a WHERE clause
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FIRST N rows, TOP N rows, LAST N rows, BOTTOM N rows...
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Max number of constraints, logical/physical activities, selecting duplicate rows
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Can't use MAX function in the WHERE clause
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Executing a procedure from a perl script
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Comparing LDAP and OiD
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Concatenating all columns generically
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Object-oriented versus structured methodology
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COALESCE on three columns
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Why WHERE cannot be used after GROUP BY
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Day of the week
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Age constraint on a date column
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DELETE or UPDATE, CASCADE or RESTRICT, part 1
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Hybrid databases explained
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Pinning and caching
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Getting a row number in a group
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Query to find size of BLOB objects
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Grouping output by week
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Inserting multiple child rows
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Setting up automatic e-mail notification of expiring passwords
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Importing and exporting a database from a remote machine
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Inserting three columns into one
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Purpose of a primary key
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What does SELECT 1 accomplish?
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Beyond petabytes
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Trigger to restrict number of rows in a table
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Inserting a carriage return in an Oracle table
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Installing 9i: what you need to do
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Aggregates for date ranges
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Column names in a UNION
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Finding the sequence of the last full backup
I have an Oracle database working in archive mode. Could you tell me how to find the sequence of the last full backup? Continue Reading
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Aggregate functions in a left outer join
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Last N rows in DB2
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Closest date before or after a given date
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Use column alias to query same field names
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Getting the SQL traffic byte size for session and transaction
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'RRRR' versus 'YYYY' in the date format
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Tools to teach normalization
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Using CASE to change SELECT column values
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What is the importance of query optimization?
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Modeling an exclusive OR relationship
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Why use a "business key" and a "primary key"?
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The significance of BCNF
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Rapid application development, structured and soft sytems methods of design
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Copying tables from one DB to another via database link
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Tools for reverse engineering a database
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Indexed views and Oracle
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Composite foreign keys, Part 1
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Running SQL*Plus scripts without supplying password
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Finding rows with non-printable characters in them
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RAID 3 or 5 for digital video storage
One reader asks, should I use RAID 3 or RAID 5 for Oracle databases? Read the answer from our expert. Continue Reading
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A one-to-many relationship as a comma-delimited list
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Workaround for ORA-04043: Can't describe object using db_link
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Creating a trigger that is executed only after table insert has been committed
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Database server versus application server
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Unique indexes and NULLs
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Checking if row is locked before using it in a procedure
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Using SEQUENCE in a Java servlet
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Can I write a trigger that fires at a particular time every day?
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Getting the table name within a trigger
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Getting the length of a LONG data type and concatenating LONG with VARCHAR2
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Inserting LONG RAW data
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Displaying results horizontally
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Columns for every day of the month
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Why is dblink between two instances on same platform slow?
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Books and authors, many-to-many
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Getting a full history of all SQL queries run on the database
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Inserting an Excel file into a BLOB field
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Updating a BLOB column without BFILE/create directory options
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Altering maxextents
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Connecting V$SESSION and V$SQL
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Operational data store versus a data warehouse
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Resolving the "ORA-12571: TNS:Packet writer failure" error
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Custom development versus ETL tool
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Result set row count along with query results
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RBS tablespace is full
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Mutating triggers explained
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AVG() function on a date field
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Cumulative sum in Access
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Determining total number of records in a cursor
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Anything similar in Oracle to Microsoft's IIF function?
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Restoring data from a .dmp file using the imp command
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Knowing when a row is locked by another user