SQL WHERE: Difference between revisions
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The <code>WHERE</code> clause may contain an arbitrary number of filter conditions separated by <code>AND</code>, <code>OR</code> and <code>NOT</code> operators, and optimally grouped together with parentheses. | The <code>WHERE</code> clause may contain an arbitrary number of filter conditions separated by <code>AND</code>, <code>OR</code> and <code>NOT</code> operators, and optimally grouped together with parentheses. | ||
<font size=-1.5> | <font size=-1.5> | ||
<font color=green><b>FROM</b></font> <filter_condition> <font color=green><b>AND</b></font>|<font color=green><b>OR</b></font <filter_condition> ... | <font color=green><b>FROM</b></font> <filter_condition> <font color=green><b>AND</b></font>|<font color=green><b>OR</b></font> <filter_condition> ... | ||
</font> | </font> | ||
Revision as of 22:04, 23 May 2024
Internal
Overview
The WHERE clause is the mechanism for filtering out unwanted data from the result set. The WHERE clause can be used with SELECT, UPDATE and DELETE, but not with INSERT.
SELECT * FROM person WHERE person.name = 'Alice';
The WHERE clause may contain an arbitrary number of filter conditions separated by AND, OR and NOT operators, and optimally grouped together with parentheses.
FROM <filter_condition> AND|OR <filter_condition> ...
Filters
Conditions
NULL in Conditions
Also see: