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information schema - How to check if a Constraint exists in Sql server?

I have this sql: ALTER TABLE dbo.ChannelPlayerSkins DROP CONSTRAINT FK_ChannelPlayerSkins_Channels but ... FK_ChannelPlayerSkins_Channels. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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information schema - How can I find all the tables in MySQL with specific column names in them?

I have 2-3 different column names that I want to look up in the entire database and list out all tables which have those columns. Is there any easy script? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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information retrieval - Why is log used when calculating term frequency weight and IDF, inverse document frequency?

The formula for IDF is log( N / df t ) instead of just N / df t. Where N = total documents in ... why-is-log-used-when-calculating-term-frequency-weight-and-idf-inverse-document...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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517 views

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information retrieval - Why is log used when calculating term frequency weight and IDF, inverse document frequency?

The formula for IDF is log( N / df t ) instead of just N / df t. Where N = total documents in ... why-is-log-used-when-calculating-term-frequency-weight-and-idf-inverse-document...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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