diff --git a/lib/TableParser.pm b/lib/TableParser.pm
index 37834f38..f9cbbfc1 100644
--- a/lib/TableParser.pm
+++ b/lib/TableParser.pm
@@ -412,7 +412,8 @@ sub get_keys {
       # will report its index as USING HASH even when this is not supported.
       # The true type should be BTREE.  See
       # http://bugs.mysql.com/bug.php?id=22632
-      if ( $engine !~ m/MEMORY|HEAP/ ) {
+      # If ANSI quoting is in effect, we may not know the engine at all.
+      if ( !$engine || $engine !~ m/MEMORY|HEAP/ ) {
          $key =~ s/USING HASH/USING BTREE/;
       }
 
@@ -454,7 +455,7 @@ sub get_keys {
       };
 
       # Find clustered key (issue 295).
-      if ( $engine =~ m/InnoDB/i && !$clustered_key ) {
+      if ( ($engine || '') =~ m/InnoDB/i && !$clustered_key ) {
          my $this_key = $keys->{$name};
          if ( $this_key->{name} eq 'PRIMARY' ) {
             $clustered_key = 'PRIMARY';
diff --git a/lib/TableSyncChunk.pm b/lib/TableSyncChunk.pm
index 9d8eaa55..65aea35e 100644
--- a/lib/TableSyncChunk.pm
+++ b/lib/TableSyncChunk.pm
@@ -182,7 +182,7 @@ sub set_checksum_queries {
 
 sub prepare_sync_cycle {
    my ( $self, $host ) = @_;
-   my $sql = 'SET @crc := "", @cnt := 0';
+   my $sql = q{SET @crc := '', @cnt := 0};
    PTDEBUG && _d($sql);
    $host->{dbh}->do($sql);
    return;
diff --git a/lib/TableSyncNibble.pm b/lib/TableSyncNibble.pm
index 9eeab295..95341ba6 100644
--- a/lib/TableSyncNibble.pm
+++ b/lib/TableSyncNibble.pm
@@ -182,7 +182,7 @@ sub set_checksum_queries {
 
 sub prepare_sync_cycle {
    my ( $self, $host ) = @_;
-   my $sql = 'SET @crc := "", @cnt := 0';
+   my $sql = q{SET @crc := '', @cnt := 0};
    PTDEBUG && _d($sql);
    $host->{dbh}->do($sql);
    return;
diff --git a/lib/TableUsage.pm b/lib/TableUsage.pm
index c2bb1139..acc349bb 100644
--- a/lib/TableUsage.pm
+++ b/lib/TableUsage.pm
@@ -870,7 +870,27 @@ sub _explain_query {
          . "Message: " . ($warning->{message} || "") . "\n";
    }
 
-   return $warning->{message};
+   return $self->ansi_to_legacy($warning->{message});
+}
+
+# Translates ANSI quoting into legacy backtick-quoting.
+# TODO: use TableParser::ansi_to_legacy instead (this code is copy/paste)
+my $ansi_quote_re = qr/" [^"]* (?: "" [^"]* )* (?<=.) "/ismx;
+sub ansi_to_legacy {
+   my ($self, $sql) = @_;
+   $sql =~ s/($ansi_quote_re)/ansi_quote_replace($1)/ge;
+   return $sql;
+}
+
+# Translates a single string from ANSI quoting into legacy quoting by
+# un-doubling embedded double-double quotes, doubling backticks, and replacing
+# the delimiters. TODO: this is a copy-paste of TableParser.pm's code
+sub ansi_quote_replace {
+   my ($val) = @_;
+   $val =~ s/^"|"$//g;
+   $val =~ s/`/``/g;
+   $val =~ s/""/"/g;
+   return "`$val`";
 }
 
 sub _get_tables {
diff --git a/t/pt-table-checksum/samples/issue_602.sql b/t/pt-table-checksum/samples/issue_602.sql
index 97dfd0f6..53eac1f9 100644
--- a/t/pt-table-checksum/samples/issue_602.sql
+++ b/t/pt-table-checksum/samples/issue_602.sql
@@ -7,16 +7,16 @@ create table t (
    b datetime not null,
    key (b)
 );
-insert into t VALUES (1, "2010-05-09 00:00:00");
-insert into t VALUES (2, "2010-05-08 00:00:00");
-insert into t VALUES (3, "2010-05-07 00:00:00");
-insert into t VALUES (4, "2010-05-06 00:00:00");
-insert into t VALUES (5, "2010-05-05 00:00:00");
-insert into t VALUES (6, "2010-05-04 00:00:00");
-insert into t VALUES (7, "2010-05-03 00:00:00");
-insert into t VALUES (8, "2010-05-02 00:00:00");
-insert into t VALUES (9, "2010-05-01 00:00:00");
-insert into t VALUES (10, "2010-04-30 00:00:00");
+insert into t VALUES (1, '2010-05-09 00:00:00');
+insert into t VALUES (2, '2010-05-08 00:00:00');
+insert into t VALUES (3, '2010-05-07 00:00:00');
+insert into t VALUES (4, '2010-05-06 00:00:00');
+insert into t VALUES (5, '2010-05-05 00:00:00');
+insert into t VALUES (6, '2010-05-04 00:00:00');
+insert into t VALUES (7, '2010-05-03 00:00:00');
+insert into t VALUES (8, '2010-05-02 00:00:00');
+insert into t VALUES (9, '2010-05-01 00:00:00');
+insert into t VALUES (10, '2010-04-30 00:00:00');
 
 -- invalid datetime
 insert into t VALUES (11, '2010-00-09 00:00:00' );
@@ -29,11 +29,11 @@ create table t2 (
    b datetime not null,
    key (b)
 );
-insert into t2 VALUES (1, "2010-00-01 00:00:01");
-insert into t2 VALUES (2, "2010-00-02 00:00:02");
-insert into t2 VALUES (3, "2010-00-03 00:00:03");
-insert into t2 VALUES (4, "2010-00-04 00:00:04");
-insert into t2 VALUES (5, "2010-00-05 00:00:05");
-insert into t2 VALUES (6, "2010-00-06 00:00:06");
-insert into t2 VALUES (7, "2010-01-07 00:00:07");
-insert into t2 VALUES (7, "2010-01-08 00:00:08");
+insert into t2 VALUES (1, '2010-00-01 00:00:01');
+insert into t2 VALUES (2, '2010-00-02 00:00:02');
+insert into t2 VALUES (3, '2010-00-03 00:00:03');
+insert into t2 VALUES (4, '2010-00-04 00:00:04');
+insert into t2 VALUES (5, '2010-00-05 00:00:05');
+insert into t2 VALUES (6, '2010-00-06 00:00:06');
+insert into t2 VALUES (7, '2010-01-07 00:00:07');
+insert into t2 VALUES (7, '2010-01-08 00:00:08');