How to use NULL or empty string in SQL

How to use NULL or empty string in SQL

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SQL : BETWEEN vs <= and >=

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querying WHERE condition to character length?

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Oracle SQL : timestamps in where clause

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SQL Not Like Statement not working

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DISTINCT clause with WHERE

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SQL JOIN where to place the WHERE condition?

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Difference between filtering queries in JOIN and WHERE?

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What is the purpose of using WHERE 1=1 in SQL statements? [duplicate]

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SQLSTATE[42S22]: Column not found: 1054 Unknown column - Laravel

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Difference between "on .. and" and "on .. where" in SQL Left Join? [duplicate]

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Is there a way to ensure WHERE clause happens after DISTINCT?

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Which performs first WHERE clause or JOIN clause

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CASE in WHERE, SQL Server

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Can the "IN" operator use LIKE-wildcards (%) in Oracle?

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