How to check if a certain “instance” alrady exists within a database? (django/postgresSql)

How to check if a certain "instance" alrady exists within a database?
(django/postgresSql)



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"instance" alrady exists within a database? (django/postgresSql)?



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3.python - Django: check whether an object already exists ...

Description:How do I check whether an object already exists, ... How to
check if a certain "instance" alrady exists within a database?
(django/postgresSql)



4.How to Check If a Record Exists in MySQL | eHow

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5.Oracle Database Instance

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8.vb.net check if record exists in dataset

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