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Null strings getting added to primary key field - Stack Overflow

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Nov 14, 2012 · Whenever the user creates a new form he should populate this field from the drop down. But if the user makes a mistake and does not select ...

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Mar 11, 2010 · Oracle treats empty VARCHAR fields as synonymous to NULL , which is somewhat controversial but it is something you have to live with. So you can ...

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Strange Primary key issue with NULL record SQL Server - Stack Overflow

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Nov 27, 2017 · An empty string in MS SQL Server is not a null (unlike oracle, e.g.) - see this SQLFiddle for a demo. Thus, it behaves like any other value ...

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How to restrict Blank values in Primary Key column - Stack Overflow

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Apr 25, 2011 · You need a check constraint. ALTER TABLE [TableName] ADD CONSTRAINT [CK_PrimaryKeyNotEmpty] CHECK ( LEN([ColumnName]) > 0 ).

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Adding string to the primary key? - sql - Stack Overflow

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Jul 24, 2013 · I managed to get a solution to work using Excel formulars and a few helper cells but am new to SQL. --CellA2 = JonesB_01 ( =concatenate(D2+E2) ).

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sql - How do I add a primary key to a column that may contain null or ...

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Jul 15, 2021 · Table A has 100 rows in it representing inventory on a shelf. I want to make column boxCode a primary key but I can't because the empty rows all ...

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Composite Primary Key is displaying as null - sql - Stack Overflow

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Dec 28, 2015 · I am implementing a composite primary key made up of 3 other values. I have created the table, and inserted data in all other fields. Am I ...

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Can a primary key be empty? If yes why did this alter cause this result?

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Mar 31, 2013 · I get a record and the id which is the primary key is empty. How is this possible? I mean it is not NULL but a primary key is not supposed to be ...

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Why can primary key column be empty in SQLite? - Stack Overflow

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Apr 26, 2013 · 1 Answer 1 ... "Empty-string" is a string with length of zero. It is NOT NULL, so it doesn't violate a null check. It most certainly IS an allowed ...

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sql - Adding NULL values in a table with a composite primary key ...

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