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Database

Interview questions

QuestionAnswer
What is a Primary Key: primary keys must contain unique values/A field that uniquely identifies a record in a table
Foreign keys foreign keys may have duplicates
What is an index summary table which lets you quickly look up the contents of any record in a table. Think of how you use an index to a book: as a quick jumping off point to finding full information about a subject.
normalisation The process of structuring data to minimise duplication and inconsistencies.
Count duplicates select distinct city, count(city) from A2Account group by city
what is a group by statement "Group By X" means "put all those with the same value for X in the one group. "Group By X, Y" means "put all those with the same values for both X and Y in the one group."
group by having? The Having is simply equivalent to a WHERE clause after the group by has executed and before the select part of the query is computed.
how much space in sybase • sp_hds • sp_helpdb • sp_spaceused
Created by: topbeagle
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