database design null values
Should we be able to store NULL values in a database. A discussion of NULL ...
Should we be able to store NULL values in a database. A discussion of NULL values with examples.
⬇ Download Full VersionWhen designing a new database, one of the first decisions we make it to def...
When designing a new database, one of the first decisions we make it to define NULL is used explicitly to indicate when a value is unknown.
⬇ Download Full VersionI disagree about the usage of NULL values in a database. NULL values are an...
I disagree about the usage of NULL values in a database. NULL values are an important factor in DB design. Actually you should not allow to.
⬇ Download Full VersionWhen you're gathering business rules and requirements for a database p...
When you're gathering business rules and requirements for a database project and implementing them in the data model, you might need to let a data value.
⬇ Download Full VersionUsers new to the world of databases are often confused by a special value p...
Users new to the world of databases are often confused by a special value particular to our field, the NULL value. Read about the proper uses.
⬇ Download Full VersionNull (or NULL) is a special marker used in Structured Query Language (SQL) ...
Null (or NULL) is a special marker used in Structured Query Language (SQL) to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E. F. Codd, SQL of the most controversial features of SQL, he defended the design of Nulls in SQL invoking the pragmatic.
⬇ Download Full Versionwishy-washy use of NULL-surrogates and instead, actually design simply by u...
wishy-washy use of NULL-surrogates and instead, actually design simply by using a specific value that serves as a surrogate for NULL.
⬇ Download Full VersionOn the other hand I have always felt that allowing NULL values in a column ...
On the other hand I have always felt that allowing NULL values in a column NULLs are dangerous in a physical database design mainly.
⬇ Download Full VersionThe “world's smallest database” I helped to code started out with NULL...
The “world's smallest database” I helped to code started out with NULLs, but we This is a Big Deal as you often end up with a don't-care value that and it is very important when writing a query or designing a database.
⬇ Download Full VersionRails defaults to letting database columns have nulls. That is, if you Row ...
Rails defaults to letting database columns have nulls. That is, if you Row 2 has a value of null (ie, undefined or unknown). Fred might have a.
⬇ Download Full VersionInformation Without Using NULL But NULL isn't a value of type Note tha...
Information Without Using NULL But NULL isn't a value of type Note that the proposal does not require the whole database design to be in 6NF.
⬇ Download Full VersionA null value, or NULL, is not the same as zero (0) or blank; NULL means tha...
A null value, or NULL, is not the same as zero (0) or blank; NULL means that no table with columns for which you want to change the scale and click Design.
⬇ Download Full VersionOK, not hate, but I would rather design a database with as few NULL So, you...
OK, not hate, but I would rather design a database with as few NULL So, you put a column into a table, allow it to have NULL values, and are.
⬇ Download Full VersionThis page asks you to explain the purpose of null values in a relational da...
This page asks you to explain the purpose of null values in a relational database while discussing the characteristics of columns.
⬇ Download Full VersionNull values in Join - Okay, I need to join two tables together where the fo...
Null values in Join - Okay, I need to join two tables together where the foreign key has valid values that are null. Is there anyway to join on a null.
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