Sometimes you might need to deploy a table to the database and it is necessary to check if a table with the same name already exists to avoid duplicates. In this case, the SQL DROP TABLE IF EXISTS command can be of great help. Another way to ensure you won’t insert duplicates is us...
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To use identity columns in a replication topology that has updates at more than one node, each node in the replication topology must use a different range of identity values, so that duplicates do not occur.For example, the Publisher could be assigne...
If multiple indexes are used in a single hint list, the duplicates are ignored, and the rest of the listed indexes are used to retrieve the rows of the table. The order of the indexes in the index hint is significant. A multiple index hint also enforces index ANDing, and the query opt...
Cause: The parser, which checks the syntax of PL/SQL statements, uses a data structure called a stack; the number of levels of nesting in the PL/SQL block exceeded the stack capacity. Action: Reorganize the block structure to avoid nesting at too deep a level. For example, move the lowe...
Cause: The parser, which checks the syntax of PL/SQL statements, uses a data structure called a stack; the number of levels of nesting in the PL/SQL block exceeded the stack capacity. Action: Reorganize the block structure to avoid nesting at too deep a level. For example, move the lowe...
Limit data: Only select the necessary columns, not SELECT *. UseEXPLAINto analyze query plans and identify bottlenecks. Avoid complex operationsin WHERE clauses (e.g., functions on columns). 35. What is Cascading in Foreign Keys? Answer: ...
Remove Duplicates in SSIS package REMOVE DUPLICATES OF A TABLE WITH OUT SORT remove time stamp from datetime value in a column Remove unwanted columns in flat file before loading to table remove whitespace within a string before import Removing commas and quotes from numeric fields in csv file us...
it materializes that result into a temporary table. Any subsequent time the result is needed, MySQL refers again to the temporary table. The optimizer may index the table with a hash index to make lookups fast and inexpensive. The index contains unique values to eliminate duplicates and make ...
SQL Server replication duplicates data from a Publisher server to a Subscriber and offers three types of replication: Transactional replication for server-to-server environments, where changes are delivered from the publisher to the subscriber as they occur. Merge replication for server-to-client e...