What Is Null In Sql
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What Is Null In Sql
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NULL values in SQL Last Updated 24 Apr 2023 In SQL there may be some records in a table that do not have values or data for every field and those fields are termed as a NULL value NULL values could be possible because at the time of data entry information is not available NULL indicates that the data is unknown, inapplicable, or even does not exist. In other words, NULL represents the missing data in the database. For example, if employees do not have phone numbers, you can store their phone numbers as empty strings.
How To Use The SQL IS NULL Condition YouTube
What Is Null In SqlIn SQL, null or NULL is a special marker used 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 null serves to fulfil the requirement that all true relational database management systems ( RDBMS ) support a representation of "missing information and . SQL uses NULLs as a special flag that signals the lack of a value for a field or a variable NULLs should be used wisely so the database gives a faithful picture of the reality it represents Some people associate NULLs
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