diff --git a/adminer/create.inc.php b/adminer/create.inc.php
index cbaa71b7..dc099216 100644
--- a/adminer/create.inc.php
+++ b/adminer/create.inc.php
@@ -197,7 +197,7 @@ if (support("partitioning")) {
 	print_fieldset("partition", lang('Partition by'), $row["partition_by"]);
 	?>
 <p>
-<?php echo html_select("partition_by", array(-1 => "") + $partition_by, $row["partition_by"], "partitionByChange(this);"); ?>
+<?php echo html_select("partition_by", array(-1 => "") + $partition_by, $row["partition_by"], "partitionByChange(this);") . doc_link("partitioning-types.html"); ?>
 (<input name="partition" value="<?php echo h($row["partition"]); ?>">)
 <?php echo lang('Partitions'); ?>: <input type="number" name="partitions" class="size<?php echo ($partition_table || !$row["partition_by"] ? " hidden" : ""); ?>" value="<?php echo h($row["partitions"]); ?>">
 <table cellspacing="0" id="partition-table"<?php echo ($partition_table ? "" : " class='hidden'"); ?>>
diff --git a/adminer/db.inc.php b/adminer/db.inc.php
index 3b58596c..a33adb2b 100644
--- a/adminer/db.inc.php
+++ b/adminer/db.inc.php
@@ -114,11 +114,17 @@ if ($adminer->homepage()) {
 			
 			echo "</table>\n";
 			if (!information_schema(DB)) {
+				$analyze = "<input type='submit' value='" . lang('Analyze') . "'>";
+				$optimize = "<input type='submit' name='optimize' value='" . lang('Optimize') . "'>";
 				echo "<fieldset><legend>" . lang('Selected') . " <span id='selected'></span></legend><div>"
-				. (ereg('^(sql|sqlite|pgsql)$', $jush) ? ($jush != "sqlite" ? "<input type='submit' value='" . lang('Analyze') . "'> " : "") . "<input type='submit' name='optimize' value='" . lang('Optimize') . "'> " : "")
-				. ($jush == "sql" ? "<input type='submit' name='check' value='" . lang('Check') . "'> <input type='submit' name='repair' value='" . lang('Repair') . "'> " : "")
-				. (support("table") ? "<input type='submit' name='truncate' value='" . lang('Truncate') . "'" . confirm() . "> " : "")
-				. "<input type='submit' name='drop' value='" . lang('Drop') . "'" . confirm() . ">\n";
+				. ($jush == "sqlite" ? $optimize . doc_command("vacuum") . " "
+				: ($jush == "pgsql" ? $analyze . doc_command("vacuum") . " $optimize" . doc_command("vacuum") . " "
+				: ($jush == "sql" ? $analyze . doc_command("analyze-table") . " $optimize" . doc_command("optimize-table") . " "
+					. "<input type='submit' name='check' value='" . lang('Check') . "'>" . doc_command("check-table") . " "
+					. "<input type='submit' name='repair' value='" . lang('Repair') . "'>" . doc_command("repair-table") . " "
+				: "")))
+				. (support("table") ? "<input type='submit' name='truncate' value='" . lang('Truncate') . "'" . confirm() . ">" . doc_command($jush == "sqlite" ? "delete" : "truncate" . ($jush == "pgsql" ? "" : "-table")) . " " : "")
+				. "<input type='submit' name='drop' value='" . lang('Drop') . "'" . confirm() . ">" . doc_command("drop-table") . "\n";
 				$databases = (support("scheme") ? schemas() : $adminer->databases());
 				if (count($databases) != 1 && $jush != "sqlite") {
 					$db = (isset($_POST["target"]) ? $_POST["target"] : (support("scheme") ? $_GET["ns"] : DB));
diff --git a/adminer/include/editing.inc.php b/adminer/include/editing.inc.php
index aa6d8d02..af2c445a 100644
--- a/adminer/include/editing.inc.php
+++ b/adminer/include/editing.inc.php
@@ -2,11 +2,11 @@
 /** Print select result
 * @param Min_Result
 * @param Min_DB connection to examine indexes
-* @param string base link for <th> fields
 * @param array
-* @return null
+* @return array $orgtables
 */
-function select($result, $connection2 = null, $href = "", $orgtables = array()) {
+function select($result, $connection2 = null, $orgtables = array()) {
+	global $jush;
 	$links = array(); // colno => orgtable - create links from these columns
 	$indexes = array(); // orgtable => array(column => colno) - primary keys
 	$columns = array(); // orgtable => array(column => ) - not selected columns in primary key
@@ -24,7 +24,7 @@ function select($result, $connection2 = null, $href = "", $orgtables = array())
 				$orgtable = $field->orgtable;
 				$orgname = $field->orgname;
 				$return[$field->table] = $orgtable;
-				if ($href) { // MySQL EXPLAIN
+				if ($orgtables && $jush == "sql") { // MySQL EXPLAIN
 					$links[$j] = ($name == "table" ? "table=" : ($name == "possible_keys" ? "indexes=" : null));
 				} elseif ($orgtable != "") {
 					if (!isset($indexes[$orgtable])) {
@@ -48,9 +48,8 @@ function select($result, $connection2 = null, $href = "", $orgtables = array())
 					$blobs[$j] = true;
 				}
 				$types[$j] = $field->type;
-				$name = h($name);
-				echo "<th" . ($orgtable != "" || $field->name != $orgname ? " title='" . h(($orgtable != "" ? "$orgtable." : "") . $orgname) . "'" : "") . ">"
-					. ($href ? "<a href='$href" . strtolower($name) . "' target='_blank' rel='noreferrer' class='help'>$name</a>" : $name)
+				echo "<th" . ($orgtable != "" || $field->name != $orgname ? " title='" . h(($orgtable != "" ? "$orgtable." : "") . $orgname) . "'" : "") . ">" . h($name)
+					. ($orgtables && $jush == "sql" ? doc_link("explain-output.html#explain_" . strtolower($name)) : "")
 				;
 			}
 			echo "</thead>\n";
@@ -70,7 +69,7 @@ function select($result, $connection2 = null, $href = "", $orgtables = array())
 				}
 			}
 			if (isset($links[$key]) && !$columns[$links[$key]]) {
-				if ($href) { // MySQL EXPLAIN
+				if ($orgtables && $jush == "sql") { // MySQL EXPLAIN
 					$table = $row[array_search("table=", $links)];
 					$link = $links[$key] . urlencode($orgtables[$table] != "" ? $orgtables[$table] : $table);
 				} else {
@@ -450,3 +449,44 @@ function ini_bytes($ini) {
 	}
 	return $val;
 }
+
+/** Create link to database documentation
+* @param string
+* @return string HTML code
+*/
+function doc_link($path) {
+	global $jush, $connection;
+	$urls = array(
+		 'sql' => "http://dev.mysql.com/doc/refman/" . substr($connection->server_info, 0, 3) . "/en/",
+		 'sqlite' => "http://www.sqlite.org/",
+		 'pgsql' => "http://www.postgresql.org/docs/" . substr($connection->server_info, 0, 3) . "/static/",
+		 'mssql' => "http://msdn.microsoft.com/library/",
+		 'oracle' => "http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/",
+	);
+	return ($urls[$jush] ? "<a href='$urls[$jush]$path' target='_blank' rel='noreferrer'><sup>?</sup></a>" : "");
+}
+
+/** Create link to documentation of database command
+* @param string lower-case
+* @return string HTML code
+*/
+function doc_command($command) {
+	global $jush;
+	switch ($jush) {
+		case 'sql': return doc_link("$command.html");
+		case 'sqlite': return doc_link("lang_" . str_replace("-", "", $command) . ".html");
+		case 'pgsql': return doc_link("sql-" . str_replace("-", "", $command) . ".html");
+		case 'mssql':
+			$links = array(
+				'drop-table' => 'ms173790',
+				'truncate-table' => 'ms177570',
+			);
+			return doc_link("$links[$command].aspx");
+		case 'oracle':
+			$links = array(
+				'drop-table' => 'statements_9003.htm',
+				'truncate-table' => 'statements_10006.htm',
+			);
+			return doc_link($links[$command]);
+	}
+}
diff --git a/adminer/processlist.inc.php b/adminer/processlist.inc.php
index b7c3e6a8..5d8cb84b 100644
--- a/adminer/processlist.inc.php
+++ b/adminer/processlist.inc.php
@@ -22,10 +22,9 @@ foreach (process_list() as $i => $row) {
 	if (!$i) {
 		echo "<thead><tr lang='en'>" . (support("kill") ? "<th>&nbsp;" : "");
 		foreach ($row as $key => $val) {
-			echo "<th>" . ($jush == "sql"
-				? "<a href='http://dev.mysql.com/doc/refman/" . substr($connection->server_info, 0, 3) . "/en/show-processlist.html#processlist_" . strtolower($key) . "' target='_blank' rel='noreferrer' class='help'>$key</a>"
-				: $key
-			);
+			echo "<th>$key"
+			. ($jush == "sql" ? doc_link("show-processlist.html#processlist_" . strtolower($key)) : "")
+			;
 		}
 		echo "</thead>\n";
 	}
diff --git a/adminer/sql.inc.php b/adminer/sql.inc.php
index 1fa96e17..b434e84f 100644
--- a/adminer/sql.inc.php
+++ b/adminer/sql.inc.php
@@ -136,7 +136,7 @@ if (!$error && $_POST) {
 										$id = "explain-$commands";
 										echo ", <a href='#$id' onclick=\"return !toggle('$id');\">EXPLAIN</a>$export";
 										echo "<div id='$id' class='hidden'>\n";
-										select($explain, $connection2, ($jush == "sql" ? "http://dev.mysql.com/doc/refman/" . substr($connection->server_info, 0, 3) . "/en/explain-output.html#explain_" : ""), $orgtables);
+										select($explain, $connection2, $orgtables);
 										echo "</div>\n";
 									} else {
 										echo $export;
diff --git a/adminer/user.inc.php b/adminer/user.inc.php
index 71e7cf6a..986e8c0c 100644
--- a/adminer/user.inc.php
+++ b/adminer/user.inc.php
@@ -142,7 +142,7 @@ if ($_POST) {
 <?php
 //! MAX_* limits, REQUIRE
 echo "<table cellspacing='0'>\n";
-echo "<thead><tr><th colspan='2'><a href='http://dev.mysql.com/doc/refman/" . substr($connection->server_info, 0, 3) . "/en/grant.html#priv_level' target='_blank' rel='noreferrer' class='help'>" . lang('Privileges') . "</a>";
+echo "<thead><tr><th colspan='2'>" . lang('Privileges') . doc_link("grant.html#priv_level");
 $i = 0;
 foreach ($grants as $object => $grant) {
 	echo '<th>' . ($object != "*.*" ? "<input name='objects[$i]' value='" . h($object) . "' size='10' autocapitalize='off'>" : "<input type='hidden' name='objects[$i]' value='*.*' size='10'>*.*"); //! separate db, table, columns, PROCEDURE|FUNCTION, routine
diff --git a/changes.txt b/changes.txt
index f0266013..456426db 100644
--- a/changes.txt
+++ b/changes.txt
@@ -6,6 +6,7 @@ Mark length as required for strings
 Add label to database selection
 Add button for dropping an index
 Display number of selected rows
+Add links to documentation
 Disable underlining links
 Improve speed of CSV import
 Don't append newlines to uploaded files, bug since Adminer 3.7.0