?? lang_createtrigger.html
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<span id="runningHeaderText">CREATE TRIGGER</span> </td>
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<span id="nsrTitle">SQLite Language Reference Documentation</span>
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<a id="seeAlsoSectionLink" href="#seeAlsoToggle" onclick="OpenSection(seeAlsoToggle)">See Also</a>
<a id="exampleSectionLink" href="#codeExampleToggle" onclick="OpenSection(codeExampleToggle)">Example</a>
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<h1 class="heading">
SQL As Understood By SQLite</h1>
<h4>
CREATE TRIGGER</h4>
<p>
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<i><font color="#ff3434">sql-statement</font></i> ::=</td>
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<b><font color="#2c2cf0">CREATE </font></b>[<b><font color="#2c2cf0">TEMP </font></b>
<big>|</big><b><font color="#2c2cf0"> TEMPORARY</font></b>]<b><font color="#2c2cf0">
TRIGGER </font></b><i><font color="#ff3434">trigger-name</font></i><b><font color="#2c2cf0">
</font></b>[<b><font color="#2c2cf0"> BEFORE </font></b><big>|</big><b><font color="#2c2cf0">
AFTER </font></b>]<b><font color="#2c2cf0"><br />
</font></b><i><font color="#ff3434">database-event</font></i><b><font color="#2c2cf0">
ON </font></b>[<b><font color="#2c2cf0"></font></b><i><font color="#ff3434">database-name</font></i><b><font
color="#2c2cf0"> <big>.</big></font></b>]<b><font color="#2c2cf0"> </font></b>
<i><font color="#ff3434">table-name</font></i><b><font color="#2c2cf0"><br />
</font></b><i><font color="#ff3434">trigger-action</font></i><b><font color="#2c2cf0"></font></b></td>
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<table cellpadding="10">
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<td align="right" width="1%" nowrap>
<i><font color="#ff3434">sql-statement</font></i> ::=</td>
<td>
<b><font color="#2c2cf0">CREATE </font></b>[<b><font color="#2c2cf0">TEMP </font></b>
<big>|</big><b><font color="#2c2cf0"> TEMPORARY</font></b>]<b><font color="#2c2cf0">
TRIGGER </font></b><i><font color="#ff3434">trigger-name</font></i><b><font color="#2c2cf0">
INSTEAD OF<br />
</font></b><i><font color="#ff3434">database-event</font></i><b><font color="#2c2cf0">
ON </font></b>[<b><font color="#2c2cf0"></font></b><i><font color="#ff3434">database-name</font></i><b><font
color="#2c2cf0"> <big>.</big></font></b>]<b><font color="#2c2cf0"> </font></b>
<i><font color="#ff3434">view-name</font></i><b><font color="#2c2cf0"><br />
</font></b><i><font color="#ff3434">trigger-action</font></i><b><font color="#2c2cf0"></font></b></td>
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<table cellpadding="10">
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<td align="right" width="1%" nowrap>
<i><font color="#ff3434">database-event</font></i> ::=</td>
<td>
<b><font color="#2c2cf0">DELETE </font></b><big>|</big><b><font color="#2c2cf0">
<br />
INSERT </font></b><big>|</big><b><font color="#2c2cf0">
<br />
UPDATE </font></b><big>|</big><b><font color="#2c2cf0">
<br />
UPDATE OF </font></b><i><font color="#ff3434">column-list</font></i><b><font color="#2c2cf0"></font></b></td>
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<i><font color="#ff3434">trigger-action</font></i> ::=</td>
<td>
<b><font color="#2c2cf0"></font></b>[<b><font color="#2c2cf0"> FOR EACH ROW </font>
</b><big>|</big><b><font color="#2c2cf0"> FOR EACH STATEMENT </font></b>]<b><font
color="#2c2cf0"> </font></b>[<b><font color="#2c2cf0"> WHEN </font></b><i><font color="#ff3434">
expression</font></i><b><font color="#2c2cf0"> </font></b>]<b><font color="#2c2cf0">
<br />
BEGIN
<br />
</font></b><i><font color="#ff3434">trigger-step</font></i><b><font
color="#2c2cf0"> ; </font></b>[<b><font color="#2c2cf0"> </font></b><i><font color="#ff3434">
trigger-step</font></i><b><font color="#2c2cf0"> ; </font></b>]<b><font color="#2c2cf0"></font></b><big>*</big><b><font
color="#2c2cf0"><br />
END</font></b></td>
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<table cellpadding="10">
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<td align="right" width="1%" nowrap>
<i><font color="#ff3434">trigger-step</font></i> ::=</td>
<td>
<b><font color="#2c2cf0"></font></b><i><font color="#ff3434">update-statement</font></i><b><font
color="#2c2cf0"> </font></b><big>|</big><b><font color="#2c2cf0"> </font></b><i><font
color="#ff3434">insert-statement</font></i><b><font color="#2c2cf0"> </font></b>
<big>|</big><b><font color="#2c2cf0">
<br />
</font></b><i><font color="#ff3434">delete-statement</font></i><b><font color="#2c2cf0">
</font></b><big>|</big><b><font color="#2c2cf0"> </font></b><i><font color="#ff3434">
select-statement</font></i><b><font color="#2c2cf0"></font></b></td>
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</p>
<p>
The CREATE TRIGGER statement is used to add triggers to the database schema. Triggers
are database operations (the <i>trigger-action</i>) that are automatically performed
when a specified database event (the <i>database-event</i>) occurs.
</p>
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