diff --git a/db_compare.py b/db_compare.py
index 2d4e9c16..3eab02a7 100644
--- a/db_compare.py
+++ b/db_compare.py
@@ -254,12 +254,19 @@ def check_novinky():
 			
 def check_pohadka():
 	old_query = "SELECT * FROM seminar_pohadky ORDER BY id"
-	new_query = """SELECT sp.id AS id, sp.autor_id AS autor_id, sp.vytvoreno AS vytvoreno, snp.treenode_ptr_id AS treenode_ptr_id, st.na_web AS text
+	new_query = """SELECT sp.id AS id, sp.autor_id AS autor_id, sp.vytvoreno AS vytvoreno, snp.treenode_ptr_id AS treenode_ptr_id, st.na_web AS text,
+				zn_pred.uloha_id AS uloha_pred, zn_po.uloha_id AS uloha_po
 			FROM seminar_pohadky AS sp 
+			-- Text pohádky
 			INNER JOIN seminar_nodes_pohadka AS snp ON sp.id = snp.pohadka_id 
 			INNER JOIN seminar_nodes_treenode AS snt ON snt.id = snp.treenode_ptr_id
 			INNER JOIN seminar_nodes_obsah AS sno ON sno.treenode_ptr_id = snt.first_child_id 
 			INNER JOIN seminar_texty AS st ON sno.text_id = st.id
+			-- Predchozí úloha
+			LEFT OUTER JOIN seminar_nodes_treenode AS ztn_pred ON ztn_pred.succ_id = snt.id
+			LEFT OUTER JOIN seminar_nodes_uloha_zadani AS zn_pred ON zn_pred.treenode_ptr_id = ztn_pred.id
+			-- Následující úloha
+			LEFT OUTER JOIN seminar_nodes_uloha_zadani AS zn_po ON zn_po.treenode_ptr_id = snt.succ_id
 
 			ORDER BY sp.id"""
 
@@ -271,6 +278,10 @@ def check_pohadka():
 		if o['autor_id'] is not None:
 			if get_user_id_for_org_id(n['autor_id']) != o['autor_id']:
 				raise ValueError("Nesedi autori u pohadky")
+		# Správné úlohy
+		spravny_klic = 'uloha_pred' if o['pred'] else 'uloha_po'
+		if o['uloha_id'] != n[spravny_klic]:
+			raise ValueError(f"Pohádka přidružená ke špatné úloze! old: {o['uloha_id']}, new: {n[spravny_klic]}, pozice: {spravny_klic}")
 
 
 # Problémy jsou rozdělené podle typů:
@@ -310,24 +321,24 @@ def check_problem_common():
 
 def check_uloha():
 	old_query = "SELECT * FROM seminar_problemy WHERE typ = 'uloha' ORDER BY id"
-	new_query = """SELECT cislo_zadani, cislo_reseni, problem_ptr_id, max_body, uzt.na_web AS text_zadani, uvt.na_web AS text_reseni
+	new_query = """SELECT cislo_zadani_id, cislo_reseni_id, problem_ptr_id, max_body, uzt.na_web AS text_zadani, uvt.na_web AS text_reseni
 	FROM seminar_ulohy
 	-- Problém:
 	JOIN seminar_problemy AS problem ON problem_ptr_id = problem.id
 	-- Text zadání:
-	INNER JOIN seminar_nodes_uloha_zadani AS uzn ON id = uzn.uloha_id
+	INNER JOIN seminar_nodes_uloha_zadani AS uzn ON problem.id = uzn.uloha_id
 	INNER JOIN seminar_nodes_treenode AS uztn ON uztn.id = uzn.treenode_ptr_id
 	INNER JOIN seminar_nodes_obsah AS uzo ON uzo.treenode_ptr_id = uztn.first_child_id
 	INNER JOIN seminar_texty AS uzt ON uzo.text_id = uzt.id
 	-- Text vzoráku:
-	INNER JOIN seminar_nodes_uloha_zadani AS uvn ON id = uvn.uloha_id
+	INNER JOIN seminar_nodes_uloha_zadani AS uvn ON problem.id = uvn.uloha_id
 	INNER JOIN seminar_nodes_treenode AS uvtn ON uvtn.id = uvn.treenode_ptr_id
 	INNER JOIN seminar_nodes_obsah AS uvo ON uvo.treenode_ptr_id = uvtn.first_child_id
 	INNER JOIN seminar_texty AS uvt ON uvo.text_id = uvt.id
 
 	ORDER BY problem_ptr_id"""
 
-	same_fields = ['cislo_zadani', 'cislo_reseni', 'text_zadani', 'text_reseni']
+	same_fields = ['cislo_zadani_id', 'cislo_reseni_id', 'text_zadani', 'text_reseni']
 	renamed_fields = [
 		('id', 'problem_ptr_id'),
 		('body', 'max_body'),
@@ -349,7 +360,7 @@ def check_tema():
 	FROM seminar_problemy
 	INNER JOIN seminar_cisla AS c ON c.id = cislo_zadani_id
 	WHERE typ IN ('tema', 'serial')
-	ORDER BY id"""
+	ORDER BY  seminar_problemy.id"""
 	new_query = """SELECT tema_typ, zad_text.na_web AS text_zadani, res_text.na_web AS text_reseni, rn.rocnik_id AS rocnik_id
 	FROM seminar_temata
 	-- Problém:
@@ -408,10 +419,10 @@ def check_res_clanek():
 	JOIN seminar_problemy AS problem ON problem_ptr_id = problem.id
 	INNER JOIN seminar_hodnoceni AS hodn ON problem.id = hodn.problem_id
 	INNER JOIN seminar_reseni AS rese ON rese.id = hodn.reseni_id
-	INNER JOIN seminar_nodes_reseni AS resnode ON resnode.reseni_id = rese.id
+	INNER JOIN seminar_nodes_otistene_reseni AS resnode ON resnode.reseni_id = rese.id
 	INNER JOIN seminar_nodes_treenode AS tn ON resnode.treenode_ptr_id = tn.id
-	INNER JOIN seminar_nodes_obsah AS on ON on.treenode_ptr_id = tn.first_child_id
-	INNER JOIN seminar_texty AS text ON text.id = on.text_id
+	INNER JOIN seminar_nodes_obsah AS son ON son.treenode_ptr_id = tn.first_child_id
+	INNER JOIN seminar_texty AS text ON text.id = son.text_id
 
 	ORDER BY problem_ptr_id"""
 	same_fields = ['text_zadani']
diff --git a/seminar/migrations/0049_auto_20190430_2354.py b/seminar/migrations/0049_auto_20190430_2354.py
index 985b3531..8abe0460 100644
--- a/seminar/migrations/0049_auto_20190430_2354.py
+++ b/seminar/migrations/0049_auto_20190430_2354.py
@@ -63,7 +63,7 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(primary_key=True, serialize=False)),
                 ('jmeno', models.CharField(max_length=256, verbose_name='jméno')),
                 ('prijmeni', models.CharField(max_length=256, verbose_name='příjmení')),
-                ('prezdivka', models.CharField(max_length=256, verbose_name='přezdívka')),
+                ('prezdivka', models.CharField(max_length=256, verbose_name='přezdívka', blank=True, null=False)),
                 ('pohlavi_muz', models.BooleanField(default=False, verbose_name='pohlaví (muž)')),
                 ('email', models.EmailField(blank=True, default='', max_length=256, verbose_name='e-mail')),
                 ('telefon', models.CharField(blank=True, default='', max_length=256, verbose_name='telefon')),