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+<a href="../session/intro.html"><h2>Session Module C Interface</h2></a><h2>Load The Difference Between Tables Into A Session</h2><blockquote><pre>int sqlite3session_diff(
+  sqlite3_session *pSession,
+  const char *zFromDb,
+  const char *zTbl,
+  char **pzErrMsg
+);
+</pre></blockquote><p>
+If it is not already attached to the session object passed as the first
+argument, this function attaches table zTbl in the same manner as the
+<a href="../session/sqlite3session_attach.html">sqlite3session_attach()</a> function. If zTbl does not exist, or if it
+does not have a primary key, this function is a no-op (but does not return
+an error).</p>
+
+<p>Argument zFromDb must be the name of a database ("main", "temp" etc.)
+attached to the same database handle as the session object that contains 
+a table compatible with the table attached to the session by this function.
+A table is considered compatible if it:</p>
+
+<p><ul>
+  <li> Has the same name,
+  <li> Has the same set of columns declared in the same order, and
+  <li> Has the same PRIMARY KEY definition.
+</ul></p>
+
+<p>If the tables are not compatible, SQLITE_SCHEMA is returned. If the tables
+are compatible but do not have any PRIMARY KEY columns, it is not an error
+but no changes are added to the session object. As with other session
+APIs, tables without PRIMARY KEYs are simply ignored.</p>
+
+<p>This function adds a set of changes to the session object that could be
+used to update the table in database zFrom (call this the "from-table") 
+so that its content is the same as the table attached to the session 
+object (call this the "to-table"). Specifically:</p>
+
+<p><ul>
+  <li> For each row (primary key) that exists in the to-table but not in 
+    the from-table, an INSERT record is added to the session object.</p>
+
+<p>  <li> For each row (primary key) that exists in the to-table but not in 
+    the from-table, a DELETE record is added to the session object.</p>
+
+<p>  <li> For each row (primary key) that exists in both tables, but features 
+    different non-PK values in each, an UPDATE record is added to the
+    session.  
+</ul></p>
+
+<p>To clarify, if this function is called and then a changeset constructed
+using <a href="../session/sqlite3session_changeset.html">sqlite3session_changeset()</a>, then after applying that changeset to 
+database zFrom the contents of the two compatible tables would be 
+identical.</p>
+
+<p>It an error if database zFrom does not exist or does not contain the
+required compatible table.</p>
+
+<p>If the operation is successful, SQLITE_OK is returned. Otherwise, an SQLite
+error code. In this case, if argument pzErrMsg is not NULL, *pzErrMsg
+may be set to point to a buffer containing an English language error 
+message. It is the responsibility of the caller to free this buffer using
+sqlite3_free().
+</p><p>See also lists of
+  <a href="../session/objlist.html">Objects</a>,
+  <a href="../session/constlist.html">Constants</a>, and
+  <a href="../session/funclist.html">Functions</a>.</p>
+