| GlossaryAbbreviation
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PK +
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| GlossaryDefinition
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1. A primary key is a field in a table that contains unique data.
, 2. A Primary Key ist a non-empty set of co … 2. A Primary Key ist a non-empty set of columns that contain non-null values and whose values uniquely identify a row. A table cannot have more than one PrimaryKey. Often the term PrimaryKey is used to refer to a set of columns which is a strict subset of all of the columns in the table. In many cases it is assumed that the PrimaryKey consists of a single column.he PrimaryKey consists of a single column.
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| GlossarySources
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https://en.wikibooks.org/wiki/A-level_Computing/AQA/Problem_Solving +
, _Programming +
, _Operating_Systems +
, _Databases_and_Networking/Databases/Primary_keys (1.); http://wiki.c2.com/?PrimaryKey (2.) +
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| GlossarySubtermOf
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Database table +
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| Has queryThis property is a special property in this wiki.
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Primary Key +
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| Creation dateThis property is a special property in this wiki.
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2 November 2017 12:42:02 +
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| Categories |
Glossary +
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| Last editor isThis property is a special property in this wiki.
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User:Lilly Schoen +
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| Modification dateThis property is a special property in this wiki.
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2 November 2017 12:42:02 +
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| Is a new pageThis property is a special property in this wiki.
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true +
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