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Handle where clauses correctly for records where the field is `null` or `not defined` - MongoDB · Issue #13949 · prisma/prisma · GitHub
Comparing the Semantics of Null, Zero, and Empty String in Relational Databases
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IndexInfo.partialFilterExpression should be null (not an empty String) when undefined [DATAMONGO-2170] · Issue #3033 · spring-projects/spring-data- mongodb · GitHub
PostgreSQL NOT NULL Constraint
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MySql replace NULL values with empty string without effecting Rowset | Web Technology Experts Notes
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PostgreSQL NOT NULL Constraint
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Comparing the Semantics of Null, Zero, and Empty String in Relational Databases
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Queries for null or empty strings
