What is foreign key in mysql?

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Please can the SQL code below be interpreted IF @xMatchCriteria='MATCH12' BEGIN IF EXISTS (Select * from #InsightData where (EmailAddress=@xDCPEmailAddress ) ) BEGIN SET @xTestMatchCriteria = @xMatchCriteria; SELECT @xCRMCustomerId=CustomerId, @xCRMDcpCustomerId=DcpCustomerId, @xCRMPortalCustomerID=PortalCustomerID,@xCRMDcpID=DcpID, @xCRMCardNumber=CardNumber, @xCRMEmailAddress=EmailAddress, @xCRMfirtLetterFirstName=firtLetterFirstName, @xCRMLastName=Surname,@xCRMAddressLine1=AddressLine1, @xCRMPostCode=PostCode FROM #InsightData where (EmailAddress=@xDCPEmailAddress ) END ELSE BEGIN SET @xTestMatchCriteria='No'+@xMatchCriteria; END END

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How do I edit a trigger in mysql?

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What are the functions used to encrypt and decrypt the data present in mysql?

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How to extract a unit value from a date and time?

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Is mysql a backend?

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What is prepare statement in mysql?

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How do I start mysql client?

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What is mysql and mysqli?

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What is mysql and why it is used?

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What are the differences between char and nchar?

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What is ndb in mysql?

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