diff --git a/plwn/enums.py b/plwn/enums.py
index 246fc3c8290958889f6d55fa5bf0d1098045bc2f..6dfcc70530dfb08d64189a99370872dacae0002e 100644
--- a/plwn/enums.py
+++ b/plwn/enums.py
@@ -104,10 +104,10 @@ class PoS(Enum):
         __order__ = 'verb noun adverb adjective ' \
             'verb_en noun_en adverb_en adjective_en'
 
-    verb = u'verb'
-    noun = u'noun'
-    adverb = u'adverb'
-    adjective = u'adjective'
+    verb = u'czasownik'
+    noun = u'rzeczownik'
+    adverb = u'przysłówek'
+    adjective = u'przymiotnik'
 
     # English (PWN) PoSes
     verb_en = u'verb_en'
@@ -346,8 +346,8 @@ class Domain(Enum):
 
     sys = u'systematyka, klasyfikacja'
 
-    adj = u'PWN: all adjective clusters'
-    adv = u'PWN: all adverbs'
+    adj = u'all adjective clusters'
+    adv = u'all adverbs'
 
     mat = u'przymiotniki materiałowe'
 
diff --git a/plwn/storages/sqlite.py b/plwn/storages/sqlite.py
index 4d918a8444c918b70dd14436b73d4acca0b615af..54f5f329dc582cb504c646ab1cff36075dfc8aae 100644
--- a/plwn/storages/sqlite.py
+++ b/plwn/storages/sqlite.py
@@ -63,195 +63,195 @@ _DB_SCHEMA_SCRIPT = u"""
 PRAGMA foreign_keys = ON;
 
 -- Metadata table. Used for version number, currently
-CREATE TABLE "tbl_plwn_meta" (
-	"name" VARCHAR(255) NOT NULL  ,
-	"value" BLOB NULL
+CREATE TABLE tbl_plwn_meta (
+    name VARCHAR(255) NOT NULL  ,
+    value BLOB NULL
 );
 
 -- Tables for constant values
-CREATE TABLE "tbl_pos" (
-	"id" INTEGER NOT NULL  ,
-	"value" VARCHAR(255) NOT NULL  ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_pos (
+    id INTEGER NOT NULL  ,
+    value VARCHAR(255) NOT NULL  ,
+    PRIMARY KEY (id)
 );
 
-CREATE TABLE "tbl_verbaspect" (
-	"id" INTEGER NOT NULL  ,
-	"value" VARCHAR(255) NOT NULL  ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_verbaspect (
+    id INTEGER NOT NULL  ,
+    value VARCHAR(255) NOT NULL  ,
+    PRIMARY KEY (id)
 );
 
-CREATE TABLE "tbl_emotionmark" (
-	"id" INTEGER NOT NULL  ,
-	"value" VARCHAR(255) NOT NULL  ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_emotionmark (
+    id INTEGER NOT NULL  ,
+    value VARCHAR(255) NOT NULL  ,
+    PRIMARY KEY (id)
 );
 
-CREATE TABLE "tbl_emotionname" (
-	"id" INTEGER NOT NULL  ,
-	"value" VARCHAR(255) NOT NULL  ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_emotionname (
+    id INTEGER NOT NULL  ,
+    value VARCHAR(255) NOT NULL  ,
+    PRIMARY KEY (id)
 );
 
-CREATE TABLE "tbl_emotionvaluation" (
-	"id" INTEGER NOT NULL  ,
-	"value" VARCHAR(255) NOT NULL  ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_emotionvaluation (
+    id INTEGER NOT NULL  ,
+    value VARCHAR(255) NOT NULL  ,
+    PRIMARY KEY (id)
 );
 
-CREATE TABLE "tbl_domain" (
-	"id" INTEGER NOT NULL  ,
-	"value" VARCHAR(255) NOT NULL  ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_domain (
+    id INTEGER NOT NULL  ,
+    value VARCHAR(255) NOT NULL  ,
+    PRIMARY KEY (id)
 );
-CREATE UNIQUE INDEX "value" ON "tbl_domain" ("value");
+CREATE UNIQUE INDEX value ON tbl_domain (value);
 
 -- Synset only gets one simple table
-CREATE TABLE "tbl_synset" (
-	"id" BLOB NOT NULL  ,
-	"legacy_id" INTEGER NULL  ,
-	"definition" TEXT NULL  ,
-	"isartificial" INTEGER NOT NULL DEFAULT '0' ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_synset (
+    id BLOB NOT NULL  ,
+    legacy_id INTEGER NULL  ,
+    definition TEXT NULL  ,
+    isartificial INTEGER NOT NULL DEFAULT '0' ,
+    PRIMARY KEY (id)
 );
 
 -- Lexical units have several tables, since they have several list-like
 -- properties. They also need indexes for lookup.
 
-CREATE TABLE "tbl_lexicalunit" (
-	"id" BLOB NOT NULL  ,
-	"legacy_id" INTEGER NULL  ,
-	"lemma" VARCHAR(255) NOT NULL  ,
-	"pos" INTEGER NOT NULL  ,
-	"variant" INTEGER NOT NULL  ,
-	"synset" BLOB NOT NULL  ,
-	"unitindex" INTEGER NOT NULL  ,
-	"definition" TEXT NULL  ,
-	"domain" INTEGER NOT NULL  ,
-	"verbaspect" INTEGER NULL  ,
-	"isemotional" INTEGER NULL  ,
-	"emotionmark" INTEGER NULL  ,
-	"emotionexample1" TEXT NULL  ,
-	"emotionexample2" TEXT NULL  ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_lexicalunit (
+    id BLOB NOT NULL  ,
+    legacy_id INTEGER NULL  ,
+    lemma VARCHAR(255) NOT NULL  ,
+    pos INTEGER NOT NULL  ,
+    variant INTEGER NOT NULL  ,
+    synset BLOB NOT NULL  ,
+    unitindex INTEGER NOT NULL  ,
+    definition TEXT NULL  ,
+    domain INTEGER NOT NULL  ,
+    verbaspect INTEGER NULL  ,
+    isemotional INTEGER NULL  ,
+    emotionmark INTEGER NULL  ,
+    emotionexample1 TEXT NULL  ,
+    emotionexample2 TEXT NULL  ,
+    PRIMARY KEY (id)
 );
 
-CREATE UNIQUE INDEX "lemma" ON "tbl_lexicalunit" ("lemma", "pos", "variant");
-CREATE INDEX "lex_i_lem_var" ON "tbl_lexicalunit" ("lemma", "variant");
-CREATE INDEX "lex_i_pos" ON "tbl_lexicalunit" ("pos");
-CREATE UNIQUE INDEX "synset" ON "tbl_lexicalunit" ("synset", "unitindex");
+CREATE UNIQUE INDEX lemma ON tbl_lexicalunit (lemma, pos, variant);
+CREATE INDEX lex_i_lem_var ON tbl_lexicalunit (lemma, variant);
+CREATE INDEX lex_i_pos ON tbl_lexicalunit (pos);
+CREATE UNIQUE INDEX synset ON tbl_lexicalunit (synset, unitindex);
 
 -- Tables dependant on lexicalunit
-CREATE TABLE "tbl_senseexample" (
-	"unitid" BLOB NOT NULL  ,
-	"example" TEXT NOT NULL  ,
-	"source" TEXT NOT NULL
+CREATE TABLE tbl_senseexample (
+    unitid BLOB NOT NULL  ,
+    example TEXT NOT NULL  ,
+    source TEXT NOT NULL
 );
-CREATE INDEX "sen_i" ON "tbl_senseexample" ("unitid");
+CREATE INDEX sen_i ON tbl_senseexample (unitid);
 
-CREATE TABLE "tbl_externallink" (
-	"unitid" BLOB NOT NULL  ,
-	"link" TEXT NOT NULL
+CREATE TABLE tbl_externallink (
+    unitid BLOB NOT NULL  ,
+    link TEXT NOT NULL
 );
-CREATE INDEX "link_i" ON "tbl_externallink" ("unitid");
+CREATE INDEX link_i ON tbl_externallink (unitid);
 
-CREATE TABLE "tbl_usagenote" (
-	"unitid" BLOB NOT NULL  ,
-	"note" TEXT NOT NULL
+CREATE TABLE tbl_usagenote (
+    unitid BLOB NOT NULL  ,
+    note TEXT NOT NULL
 );
-CREATE INDEX "note_i" ON "tbl_usagenote" ("unitid");
+CREATE INDEX note_i ON tbl_usagenote (unitid);
 
-CREATE TABLE "tbl_unitemotionname" (
-	"unitid" BLOB NOT NULL  ,
-	"nameid" INTEGER NOT NULL  ,
-	PRIMARY KEY ("unitid", "nameid")
+CREATE TABLE tbl_unitemotionname (
+    unitid BLOB NOT NULL  ,
+    nameid INTEGER NOT NULL  ,
+    PRIMARY KEY (unitid, nameid)
 );
 
-CREATE TABLE "tbl_unitemotionvaluation" (
-	"unitid" BLOB NOT NULL  ,
-	"valuationid" INTEGER NOT NULL  ,
-	PRIMARY KEY ("unitid", "valuationid")
+CREATE TABLE tbl_unitemotionvaluation (
+    unitid BLOB NOT NULL  ,
+    valuationid INTEGER NOT NULL  ,
+    PRIMARY KEY (unitid, valuationid)
 );
 
 -- Relation tables --
 
 -- The for below are used to gather combinations of parent / child relation
 -- names.
-CREATE TABLE "tbl_synsetrelationparentpart" (
-	"id" INTEGER NOT NULL  ,
-	"name" VARCHAR(255) NOT NULL  ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_synsetrelationparentpart (
+    id INTEGER NOT NULL  ,
+    name VARCHAR(255) NOT NULL  ,
+    PRIMARY KEY (id)
 );
-CREATE TABLE "tbl_synsetrelationchildpart" (
-	"id" INTEGER NOT NULL  ,
-	"name" VARCHAR(255) NOT NULL  ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_synsetrelationchildpart (
+    id INTEGER NOT NULL  ,
+    name VARCHAR(255) NOT NULL  ,
+    PRIMARY KEY (id)
 );
-CREATE TABLE "tbl_lexicalrelationparentpart" (
-	"id" INTEGER NOT NULL  ,
-	"name" VARCHAR(255) NOT NULL  ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_lexicalrelationparentpart (
+    id INTEGER NOT NULL  ,
+    name VARCHAR(255) NOT NULL  ,
+    PRIMARY KEY (id)
 );
-CREATE TABLE "tbl_lexicalrelationchildpart" (
-	"id" INTEGER NOT NULL  ,
-	"name" VARCHAR(255) NOT NULL  ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_lexicalrelationchildpart (
+    id INTEGER NOT NULL  ,
+    name VARCHAR(255) NOT NULL  ,
+    PRIMARY KEY (id)
 );
-CREATE UNIQUE INDEX "name" ON "tbl_lexicalrelationchildpart" ("name");
-CREATE UNIQUE INDEX "parentpart" ON "tbl_lexicalrelationtype" (
-        "parentpart", 
-        "childpart"
+CREATE UNIQUE INDEX name ON tbl_lexicalrelationchildpart (name);
+CREATE UNIQUE INDEX parentpart ON tbl_lexicalrelationtype (
+        parentpart,
+        childpart
 );
 
 -- Next, gather these parts into relation types themselves.
 -- Parent can't be NULL - the no-parent case will be handled by a special empty
 -- string parent. This is so that UNIQUE works correctly.
-CREATE TABLE "tbl_synsetrelationtype" (
-	"id" BLOB NOT NULL  ,
-	"legacy_id" INTEGER NULL  ,
-	"parentpart" INTEGER NOT NULL  ,
-	"childpart" INTEGER NOT NULL  ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_synsetrelationtype (
+    id BLOB NOT NULL  ,
+    legacy_id INTEGER NULL  ,
+    parentpart INTEGER NOT NULL  ,
+    childpart INTEGER NOT NULL  ,
+    PRIMARY KEY (id)
 );
-CREATE TABLE "tbl_lexicalrelationtype" (
-	"id" BLOB NOT NULL  ,
-	"legacy_id" INTEGER NULL  ,
-	"parentpart" INTEGER NOT NULL  ,
-	"childpart" INTEGER NOT NULL  ,
-	PRIMARY KEY ("id")
+CREATE TABLE tbl_lexicalrelationtype (
+    id BLOB NOT NULL  ,
+    legacy_id INTEGER NULL  ,
+    parentpart INTEGER NOT NULL  ,
+    childpart INTEGER NOT NULL  ,
+    PRIMARY KEY (id)
 );
 
 -- The below tables are simply maps of relation aliases to their main IDs.
 -- Reverse indexes are needed, too.
-CREATE TABLE "tbl_synsetrelationalias" (
-	"name" VARCHAR(255) NOT NULL  ,
-	"relationid" BLOB NOT NULL  ,
-	PRIMARY KEY ("name")
+CREATE TABLE tbl_synsetrelationalias (
+    name VARCHAR(255) NOT NULL  ,
+    relationid BLOB NOT NULL  ,
+    PRIMARY KEY (name)
 );
-CREATE INDEX "synsetrelationalias_irev" ON "tbl_synsetrelationalias" (
-        "relationid"
+CREATE INDEX synsetrelationalias_irev ON tbl_synsetrelationalias (
+        relationid
 );
-CREATE TABLE "tbl_lexicalrelationalias" (
-	"name" VARCHAR(255) NOT NULL  ,
-	"relationid" BLOB NOT NULL  ,
-	PRIMARY KEY ("name")
+CREATE TABLE tbl_lexicalrelationalias (
+    name VARCHAR(255) NOT NULL  ,
+    relationid BLOB NOT NULL  ,
+    PRIMARY KEY (name)
 );
-CREATE INDEX "lexicalrelationalias_irev" ON "tbl_lexicalrelationalias" (
-        "relationid"
+CREATE INDEX lexicalrelationalias_irev ON tbl_lexicalrelationalias (
+        relationid
 );
 
 -- Next are finally the relation instances
-CREATE TABLE "tbl_synsetrelation" (
-	"source" BLOB NOT NULL  ,
-	"relationtype" BLOB NOT NULL  ,
-	"target" BLOB NOT NULL  ,
-	PRIMARY KEY ("source", "relationtype", "target")
+CREATE TABLE tbl_synsetrelation (
+    source BLOB NOT NULL  ,
+    relationtype BLOB NOT NULL  ,
+    target BLOB NOT NULL  ,
+    PRIMARY KEY (source, relationtype, target)
 );
-CREATE TABLE "tbl_lexicalrelation" (
-	"source" BLOB NOT NULL  ,
-	"relationtype" BLOB NOT NULL  ,
-	"target" BLOB NOT NULL  ,
-	PRIMARY KEY ("source", "relationtype", "target")
+CREATE TABLE tbl_lexicalrelation (
+    source BLOB NOT NULL  ,
+    relationtype BLOB NOT NULL  ,
+    target BLOB NOT NULL  ,
+    PRIMARY KEY (source, relationtype, target)
 );
 
 -- Insert the special empty values for the parent part tables
@@ -284,7 +284,7 @@ _RELINST_TABLES = {
 class PLWordNet(bs.PLWordNetBase):
 
     _STORAGE_NAME = 'sqlite3'
-    _SCHEMA_VERSION = 4
+    _SCHEMA_VERSION = '4'
 
     @classmethod
     def from_reader(cls, reader, dump_to=None):
@@ -366,8 +366,8 @@ class PLWordNet(bs.PLWordNetBase):
         with closing(self._db.cursor()) as cur:
             cur.execute(
                 u"""
-                SELECT lemma, pos.value, variant, synset
-                FROM tbl_lexicalunit 
+                SELECT lemma, tbl_pos.value, variant, synset
+                FROM tbl_lexicalunit
                     JOIN tbl_pos ON tbl_lexicalunit.pos = tbl_pos.id
                 WHERE tbl_lexicalunit.id = ?
                 """,
@@ -546,7 +546,8 @@ class PLWordNet(bs.PLWordNetBase):
         with closing(self._db.cursor()) as cur:
             cur.execute(
                 u"""
-                SELECT tbl_lexicalunit.id, lemma, pos.value, variant, synset
+                SELECT tbl_lexicalunit.id, lemma, tbl_pos.value,
+                    variant, synset
                 FROM tbl_lexicalunit
                     JOIN tbl_pos ON tbl_lexicalunit.pos = tbl_pos.id
                 WHERE COALESCE(lemma = :lem, :defval)
@@ -599,7 +600,10 @@ class PLWordNet(bs.PLWordNetBase):
                 ((en.value,) for en in en.EmotionName),
             ).close()
             self._db.executemany(
-                u"INSERT OR IGNORE INTO tbl_emotionvaluation (value) VALUES (?)",
+                u"""
+                INSERT OR IGNORE INTO tbl_emotionvaluation (value)
+                VALUES (?)
+                """,
                 ((ev.value,) for ev in en.EmotionValuation),
             ).close()
             self._db.executemany(
@@ -678,6 +682,7 @@ class LexicalUnit(bs.LexicalUnitBase):
         self._var = variant
         self._synid = synid
         # Rest is unitialized
+        self._leg_id = _UNFETCHED
         self._syn = _UNFETCHED
         self._def = _UNFETCHED
         self._usn = _UNFETCHED
@@ -717,6 +722,17 @@ class LexicalUnit(bs.LexicalUnitBase):
     def is_english(self):
         return self._pos.is_english
 
+    @property
+    def legacy_id(self):
+        if self._leg_id is _UNFETCHED:
+            with closing(self._db.cursor()) as cur:
+                cur.execute(
+                    u"SELECT legacy_id FROM tbl_lexicalunit WHERE id = ?",
+                    (self._id,),
+                )
+                self._leg_id = cur.fetchone()[0]
+        return self._leg_id
+
     @property
     def synset(self):
         if self._syn is _UNFETCHED or self._syn() is None:
@@ -934,7 +950,8 @@ class LexicalUnit(bs.LexicalUnitBase):
         with closing(self._db.cursor()) as cur:
             cur.execute(
                 u"""
-                SELECT tbl_lexicalunit.id, lemma, tbl_pos.value, variant, synset
+                SELECT tbl_lexicalunit.id,
+                    lemma, tbl_pos.value, variant, synset
                 FROM tbl_lexicalrelation
                     JOIN tbl_lexicalunit ON tbl_lexicalunit.id = target
                     JOIN tbl_pos ON tbl_lexicalunit.pos = tbl_pos.id
@@ -997,6 +1014,7 @@ class Synset(bs.SynsetBase):
 
         self._units = _UNFETCHED
         self._def = _UNFETCHED
+        self._leg_id = _UNFETCHED
 
         self._pos = _UNFETCHED
         self._is_polish = _UNFETCHED
@@ -1033,7 +1051,8 @@ class Synset(bs.SynsetBase):
                 cur.execute(
                     u"""
                     SELECT tbl_lexicalunit.id, lemma, tbl_pos.value, variant
-                    FROM tbl_lexicalunit JOIN tbl_pos ON tbl_lexicalunit.pos = tbl_pos.id
+                    FROM tbl_lexicalunit
+                        JOIN tbl_pos ON tbl_lexicalunit.pos = tbl_pos.id
                     WHERE synset = ?
                     ORDER BY unitindex
                     """,
@@ -1054,6 +1073,17 @@ class Synset(bs.SynsetBase):
             assert self._units
         return self._units
 
+    @property
+    def legacy_id(self):
+        if self._leg_id is _UNFETCHED:
+            with closing(self._db.cursor()) as cur:
+                cur.execute(
+                    u"SELECT legacy_id FROM tbl_synset WHERE id = ?",
+                    (self._id,),
+                )
+                self._leg_id = cur.fetchone()[0]
+        return self._leg_id
+
     @property
     def definition(self):
         if self._def is _UNFETCHED:
@@ -1313,18 +1343,18 @@ class _DBBuilder(object):
         # Synset to lexical units relations also need to be deferred.
         self._synid2lexids = coll.defaultdict(list)
         # Cache IDs of constant values
-        with closing(db.execute(u"SELECT value, id FROM tbl_pos")) as cur:
+        with closing(db.execute(u"SELECT value, id FROM pos")) as cur:
             self._posids = dict(cur)
-        with closing(db.execute(u"SELECT value, id FROM tbl_verbaspect")) as cur:
+        with closing(db.execute(u"SELECT value, id FROM verbaspect")) as cur:
             self._vaids = dict(cur)
-        with closing(db.execute(u"SELECT value, id FROM tbl_emotionmark")) as cur:
+        with closing(db.execute(u"SELECT value, id FROM emotionmark")) as cur:
             self._emids = dict(cur)
-        with closing(db.execute(u"SELECT value, id FROM tbl_emotionname")) as cur:
+        with closing(db.execute(u"SELECT value, id FROM emotionname")) as cur:
             self._enids = dict(cur)
-        with closing(db.execute(u"SELECT value, id FROM tbl_emotionvaluation")) \
+        with closing(db.execute(u"SELECT value, id FROM emotionvaluation")) \
                 as cur:
             self._evids = dict(cur)
-        with closing(db.execute(u"SELECT value, id FROM tbl_domain")) as cur:
+        with closing(db.execute(u"SELECT value, id FROM domain")) as cur:
             self._dmids = dict(cur)
 
     def __call__(self, reader):
@@ -1351,7 +1381,7 @@ class _DBBuilder(object):
     def _insert_synset(self, syn_node):
         self._db.execute(
             u"""
-            INSERT INTO tbl_synset (id, definition, isartificial)
+            INSERT INTO synset (id, definition, isartificial)
             VALUES (?, ?, ?)
             """,
             (syn_node.id, syn_node.definition, syn_node.is_artificial),
@@ -1402,7 +1432,7 @@ class _DBBuilder(object):
                     try:
                         cur.execute(
                             u"""
-                            INSERT INTO tbl_lexicalunit (
+                            INSERT INTO lexicalunit (
                                 id, lemma, pos, variant,
                                 synset, unitindex,
                                 definition, domain, verbaspect,
@@ -1453,7 +1483,7 @@ class _DBBuilder(object):
 
                     cur.executemany(
                         u"""
-                        INSERT INTO tbl_senseexample (unitid, example, source)
+                        INSERT INTO senseexample (unitid, example, source)
                         VALUES (?, ?, ?)
                         """,
                         (
@@ -1464,14 +1494,14 @@ class _DBBuilder(object):
                     )
                     cur.executemany(
                         u"""
-                        INSERT INTO tbl_usagenote (unitid, note)
+                        INSERT INTO usagenote (unitid, note)
                         VALUES (?, ?)
                         """,
                         ((lu_node.id, note) for note in lu_node.usage_notes),
                     )
                     cur.executemany(
                         u"""
-                        INSERT INTO tbl_externallink (unitid, link)
+                        INSERT INTO externallink (unitid, link)
                         VALUES (?, ?)
                         """,
                         ((lu_node.id, link)
@@ -1479,7 +1509,7 @@ class _DBBuilder(object):
                     )
                     cur.executemany(
                         u"""
-                        INSERT INTO tbl_unitemotionname (unitid, nameid)
+                        INSERT INTO unitemotionname (unitid, nameid)
                         VALUES (?, ?)
                         """,
                         (
@@ -1489,7 +1519,7 @@ class _DBBuilder(object):
                     )
                     cur.executemany(
                         u"""
-                        INSERT INTO tbl_unitemotionvaluation (unitid, valuationid)
+                        INSERT INTO unitemotionvaluation (unitid, valuationid)
                         VALUES (?, ?)
                         """,
                         (
@@ -1626,10 +1656,10 @@ class _DBBuilder(object):
         with closing(self._db.cursor()) as cur:
             cur.execute(
                 u"""
-                SELECT tbl_synset.id
-                FROM tbl_synset
-                    LEFT JOIN tbl_lexicalunit ON tbl_synset.id = tbl_lexicalunit.synset
-                WHERE tbl_lexicalunit.synset IS NULL
+                SELECT synset.id
+                FROM synset
+                    LEFT JOIN lexicalunit ON synset.id = lexicalunit.synset
+                WHERE lexicalunit.synset IS NULL
                 """,
             )
             empties = tuple(row[0] for row in cur)
@@ -1642,7 +1672,7 @@ class _DBBuilder(object):
             _LOG.warning('Synset %d is empty', synid)
 
         self._db.execute(
-            u"DELETE FROM tbl_synset WHERE id IN ({})".format(
+            u"DELETE FROM synset WHERE id IN ({})".format(
                 u','.join(u'?' * len(empties))
             ),
             empties,