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+<!DOCTYPE html>
+<html><head>
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+<title>UPSERT</title>
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+<body>
+<div class=nosearch>
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+<div class=fancy>
+<div class=nosearch>
+<div class="fancy_title">
+UPSERT
+</div>
+</div>
+
+
+
+
+<h1 id="syntax"><span>1. </span>Syntax</h1>
+<p><b><a href="syntax/upsert-clause.html">upsert-clause:</a></b>
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+<p><b><a href="syntax/column-name-list.html">column-name-list:</a></b>
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+</svg>
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+</div>
+</div>
+<p><b><a href="syntax/raise-function.html">raise-function:</a></b>
+<button id='xe8250198' onclick='hideorshow("xe8250198","xb1a9a161")'>show</button></p>
+ <div id='xb1a9a161' style='display:none;' class='imgcontainer'>
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+<path d="M525,1155L597,1155" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
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+<p><b><a href="syntax/common-table-expression.html">common-table-expression:</a></b>
+<button id='xd5f8ca5b' onclick='hideorshow("xd5f8ca5b","x0116d3e2")'>show</button></p>
+ <div id='x0116d3e2' style='display:none;' class='imgcontainer'>
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+<path d="M66,150L395,150" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+<polygon points="348,6 336,10 336,2" style="fill:rgb(0,0,0)"/>
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+<path d="M348,6 L 473,6 Q 488,6 488,17 Q 488,29 495,29 L 503,29" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
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+</div>
+</div>
+<p><b><a href="syntax/compound-operator.html">compound-operator:</a></b>
+<button id='x57a8aae3' onclick='hideorshow("x57a8aae3","x7a5d86ca")'>show</button></p>
+ <div id='x7a5d86ca' style='display:none;' class='imgcontainer'>
+ <div style="max-width:293px"><svg xmlns='http://www.w3.org/2000/svg' class="pikchr" viewBox="0 0 293.842 147.96">
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+<path d="M83,32L127,32A15 15 0 0 0 142 17A15 15 0 0 0 127 2L83,2A15 15 0 0 0 68 17A15 15 0 0 0 83 32Z" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
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+</div>
+</div>
+<p><b><a href="syntax/join-clause.html">join-clause:</a></b>
+<button id='xf500aaa5' onclick='hideorshow("xf500aaa5","x2d8f1a68")'>show</button></p>
+ <div id='x2d8f1a68' style='display:none;' class='imgcontainer'>
+ <div style="max-width:793px"><svg xmlns='http://www.w3.org/2000/svg' class="pikchr" viewBox="0 0 793.282 84.24">
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+<path d="M32,32L193,32L193,2L32,2Z" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
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+<p><b><a href="syntax/join-constraint.html">join-constraint:</a></b>
+<button id='x6229a7cc' onclick='hideorshow("x6229a7cc","x6e07e380")'>show</button></p>
+ <div id='x6e07e380' style='display:none;' class='imgcontainer'>
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+</div>
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+<p><b><a href="syntax/join-operator.html">join-operator:</a></b>
+<button id='x5b581b92' onclick='hideorshow("x5b581b92","xf135f136")'>show</button></p>
+ <div id='xf135f136' style='display:none;' class='imgcontainer'>
+ <div style="max-width:620px"><svg xmlns='http://www.w3.org/2000/svg' class="pikchr" viewBox="0 0 620.333 255.312">
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+<path d="M66,86L133,86A15 15 0 0 0 148 71A15 15 0 0 0 133 56L66,56A15 15 0 0 0 50 71A15 15 0 0 0 66 86Z" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
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+<path d="M475,192 L 482,192 Q 490,192 490,185 L 490,177" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
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+<path d="M475,238 L 482,238 Q 490,238 490,223 L 490,71 L 490,56" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
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+</div>
+</div>
+</div>
+<p><b><a href="syntax/ordering-term.html">ordering-term:</a></b>
+<button id='x93623079' onclick='hideorshow("x93623079","xb79f383f")'>show</button></p>
+ <div id='xb79f383f' style='display:none;' class='imgcontainer'>
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+<path d="M462,97L492,97A15 15 0 0 0 508 82A15 15 0 0 0 492 67L462,67A15 15 0 0 0 447 82A15 15 0 0 0 462 97Z" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
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+<path d="M462,59L479,59A15 15 0 0 0 494 44L494,44A15 15 0 0 0 479 29L462,29A15 15 0 0 0 447 44L447,44A15 15 0 0 0 462 59Z" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
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+<path d="M670,17L780,17" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+</svg>
+</div>
+</div>
+<p><b><a href="syntax/result-column.html">result-column:</a></b>
+<button id='xbf879514' onclick='hideorshow("xbf879514","x9a2239ac")'>show</button></p>
+ <div id='x9a2239ac' style='display:none;' class='imgcontainer'>
+ <div style="max-width:398px"><svg xmlns='http://www.w3.org/2000/svg' class="pikchr" viewBox="0 0 398.054 163.08">
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+<p><b><a href="syntax/window-defn.html">window-defn:</a></b>
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+<path d="M382,17L630,17" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
+</svg>
+</div>
+<p><b><a href="syntax/signed-number.html">signed-number:</a></b>
+<button id='x605c2f46' onclick='hideorshow("x605c2f46","x6e27de8e")'>show</button></p>
+ <div id='x6e27de8e' style='display:none;' class='imgcontainer'>
+ <div style="max-width:292px"><svg xmlns='http://www.w3.org/2000/svg' class="pikchr" viewBox="0 0 292.013 99.576">
+<circle cx="5" cy="17" r="3.6" style="fill:none;stroke-width:2.16;stroke:rgb(0,0,0);" />
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+<text x="66" y="82" text-anchor="middle" font-weight="bold" fill="rgb(0,0,0)" dominant-baseline="central">-</text>
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+</svg>
+</div>
+</div>
+</div>
+</div>
+<p><b><a href="syntax/indexed-column.html">indexed-column:</a></b>
+<button id='x23f9d137' onclick='hideorshow("x23f9d137","x9e579f63")'>show</button></p>
+ <div id='x9e579f63' style='display:none;' class='imgcontainer'>
+ <div style="max-width:696px"><svg xmlns='http://www.w3.org/2000/svg' class="pikchr" viewBox="0 0 696.36 102.6">
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+</div>
+</div>
+</div>
+
+
+<h1 id="description"><span>2. </span>Description</h1>
+
+<p>UPSERT is a clause added to <a href="lang_insert.html">INSERT</a> that causes the
+INSERT to behave as an <a href="lang_update.html">UPDATE</a> or a no-op if the INSERT would violate
+a uniqueness constraint.
+UPSERT is not standard SQL. UPSERT in SQLite follows the
+syntax established by PostgreSQL, with generalizations.
+
+</p><p>An UPSERT is an ordinary <a href="lang_insert.html">INSERT</a> statement that is followed by
+one or more ON CONFLICT clauses, as shown in the syntax diagram above.
+
+</p><p>The syntax in between the "ON CONFLICT" and "DO" keywords
+is called the "conflict target". The conflict target specifies a
+uniqueness constraint that will trigger the upsert. The conflict target
+may be omitted on the last ON CONFLICT clause in the INSERT statement, but
+is required for all other ON CONFLICT clauses.
+
+</p><p>If the insert operation would cause the conflict target uniqueness
+constraint to fail, then the insert is omitted and
+the corresponding DO NOTHING or DO UPDATE operation is performed instead.
+The ON CONFLICT clauses are checked in the order specified. If the last
+ON CONFLICT clause omits the conflict target, then it will fire if any
+uniqueness constraint fails which is not captured by prior ON CONFLICT clauses.
+
+</p><p>Only a single ON CONFLICT clause, specifically the first ON CONFLICT
+clause with a matching conflict target, may run for each row of the INSERT.
+When an ON CONFLICT clause fires, all subsequent ON CONFLICT clauses are
+bypassed for that one row.
+
+</p><p>
+In the case of a multi-row insert, the upsert decision is made separately
+for each row of the insert.
+
+</p><p>The UPSERT processing happens only for uniqueness constraints.
+A "uniqueness constraint"
+is an explicit UNIQUE or PRIMARY KEY constraint within
+the CREATE TABLE statement, or a <a href="lang_createindex.html#uniqueidx">unique index</a>.
+UPSERT does not intervene for failed NOT NULL, CHECK,
+or foreign key constraints
+or for constraints that are implemented using triggers.
+
+</p><p>Column names in the expressions of a DO UPDATE refer to the original
+unchanged value of the column, before the attempted INSERT. To use the
+value that would have been inserted had the constraint not failed,
+add the special "excluded." table qualifier to the column name.
+
+</p><h2 id="examples"><span>2.1. </span>Examples</h2>
+
+<p>Some examples will help illustrate how UPSERT works:
+
+</p><blockquote><pre>
+CREATE TABLE vocabulary(word TEXT PRIMARY KEY, count INT DEFAULT 1);
+INSERT INTO vocabulary(word) VALUES('jovial')
+ ON CONFLICT(word) DO UPDATE SET count=count+1;
+</pre></blockquote>
+
+<p>The upsert above inserts the new vocabulary word "jovial" if that
+word is not already in the dictionary, or if it is already in the
+dictionary, it increments the counter. The "count+1" expression
+could also be written as "vocabulary.count". PostgreSQL requires the
+second form, but SQLite accepts either.
+
+</p><blockquote><pre>
+CREATE TABLE phonebook(name TEXT PRIMARY KEY, phonenumber TEXT);
+INSERT INTO phonebook(name,phonenumber) VALUES('Alice','704-555-1212')
+ ON CONFLICT(name) DO UPDATE SET phonenumber=excluded.phonenumber;
+</pre></blockquote>
+
+<p>In the second example, the expression in the DO UPDATE clause is
+of the form "excluded.phonenumber". The "excluded." prefix causes the
+"phonenumber" to refer to the value for phonenumber that would have been
+inserted had there been no conflict. Hence, the effect of the upsert
+is to insert a phonenumber of Alice if none exists, or to overwrite
+any prior phonenumber for Alice with the new one.
+
+</p><p>Note that the DO UPDATE clause acts only on the single row
+that experienced the constraint error during INSERT. It is not
+necessary to include a WHERE clause that restricts the action
+to that one row. The only use for the WHERE clause at
+the end of the DO UPDATE is to optionally change the DO UPDATE
+into a no-op depending on the original and/or new values.
+For example:
+
+</p><blockquote><pre>
+CREATE TABLE phonebook2(
+ name TEXT PRIMARY KEY,
+ phonenumber TEXT,
+ validDate DATE
+);
+INSERT INTO phonebook2(name,phonenumber,validDate)
+ VALUES('Alice','704-555-1212','2018-05-08')
+ ON CONFLICT(name) DO UPDATE SET
+ phonenumber=excluded.phonenumber,
+ validDate=excluded.validDate
+ WHERE excluded.validDate>phonebook2.validDate;
+</pre></blockquote>
+
+<p>In this last example, the phonebook2 entry is only
+updated if the validDate for the newly inserted value is
+newer than the entry already in the table. If the table already
+contains an entry with the same name and a current validDate,
+then the WHERE clause causes the DO UPDATE to become a no-op.
+
+<a name="parseambig"></a>
+
+
+</p><h2 id="parsing_ambiguity"><span>2.2. </span>Parsing Ambiguity</h2>
+
+<p>When the <a href="lang_insert.html">INSERT</a> statement to which the UPSERT is attached
+takes its values from a <a href="lang_select.html">SELECT</a> statement, there is a potential
+parsing ambiguity. The parser might not be able to tell if the
+"ON" keyword is introducing the UPSERT or if it is the ON clause
+of a join. To work around this, the SELECT statement should always
+include a WHERE clause, even if that WHERE clause is just
+"WHERE true".
+
+</p><p>Ambiguous use of ON:
+
+</p><blockquote><pre>
+INSERT INTO t1 SELECT * FROM t2
+ON CONFLICT(x) DO UPDATE SET y=excluded.y;
+</pre></blockquote>
+
+<p>Ambiguity resolved using a WHERE clause:
+
+</p><blockquote><pre>
+INSERT INTO t1 SELECT * FROM t2 <font color="blue">WHERE true</font>
+ON CONFLICT(x) DO UPDATE SET y=excluded.y;
+</pre></blockquote>
+
+<h1 id="limitations"><span>3. </span>Limitations</h1>
+
+<p>UPSERT does not currently work for <a href="vtab.html">virtual tables</a>.
+
+</p><p>The <a href="lang_conflict.html">conflict resolution algorithm</a> for the update operation
+of the DO UPDATE clause is always ABORT. In other words, the behavior
+is as if the DO UPDATE clause were actually written as
+"DO UPDATE OR ABORT". If the DO UPDATE clause encounters any
+constraint violation, the entire INSERT statement rolls back and
+halts. This is true even if the DO UPDATE clause is
+contained within an INSERT statement or a trigger that specifies some
+other conflict resolution algorithm.
+
+</p><h1 id="history"><span>4. </span>History</h1>
+
+<p>UPSERT syntax was added to SQLite with version 3.24.0 (2018-06-04).
+The original implementation closely followed the PostgreSQL syntax in that
+it only permitted a single ON CONFLICT clause and it required a
+conflict target for on DO UPDATE.
+The syntax was generalized to permit multiple ON CONFLICT clauses and
+to allow DO UPDATE resolution without a conflict target in
+SQLite version 3.35.0 (2021-03-12).
+</p><p align="center"><small><i>This page last modified on <a href="https://sqlite.org/docsrc/honeypot" id="mtimelink" data-href="https://sqlite.org/docsrc/finfo/pages/lang_upsert.in?m=e0df5cdd65">2022-01-08 05:02:57</a> UTC </small></i></p>
+