diff --git a/sql/appearances.sql b/sql/appearances.sql
index 3836fb2..0a5060d 100644
--- a/sql/appearances.sql
+++ b/sql/appearances.sql
@@ -1,4 +1,5 @@
 pragma foreign_keys = 0;
+pragma ignore_check_constraints = 1;
 
 begin;
 attach database 'baseball-raw.db' as 'raw';
@@ -38,7 +39,7 @@ CREATE TABLE IF NOT EXISTS "appearances" (
 	"G_lf"	NUMERIC,
 	"G_cf"	NUMERIC,
 	"G_rf"	NUMERIC,
-	"G_of"	NUMERIC,
+	"G_of"	NUMERIC check (G_of = G_lf + G_cf + G_rf),
 	"G_dh"	NUMERIC,
 	"G_ph"	NUMERIC,
 	"G_pr"	NUMERIC,
diff --git a/sql/awardssharemanagers.sql b/sql/awardssharemanagers.sql
index 83c07e4..68da9c3 100644
--- a/sql/awardssharemanagers.sql
+++ b/sql/awardssharemanagers.sql
@@ -8,7 +8,7 @@ CREATE TABLE IF NOT EXISTS "awardssharemanagers" (
 	"year"	NUMERIC,
 	"league"	TEXT,
 	"manager"	TEXT,
-	"pointsWon"	NUMERIC,
+	"pointsWon"	NUMERIC check (pointsWon <= pointsMax),
 	"pointsMax"	NUMERIC,
 	"votesFirst"	NUMERIC,
 	PRIMARY KEY("manager","award","year","league"),
diff --git a/sql/awardsshareplayers.sql b/sql/awardsshareplayers.sql
index 5d12d8d..ef7837e 100644
--- a/sql/awardsshareplayers.sql
+++ b/sql/awardsshareplayers.sql
@@ -19,7 +19,7 @@ CREATE TABLE IF NOT EXISTS main."awardsshareplayers" (
 	"year"	NUMERIC,
 	"league"	TEXT,
 	"player"	TEXT,
-	"pointsWon"	NUMERIC,
+	"pointsWon"	NUMERIC check (pointsWon <= pointsMax),
 	"pointsMax"	NUMERIC,
 	"votesFirst"	NUMERIC,
 	PRIMARY KEY("award","year","player","league"),
diff --git a/sql/fielding.sql b/sql/fielding.sql
index d09cc21..683d6a5 100644
--- a/sql/fielding.sql
+++ b/sql/fielding.sql
@@ -1,4 +1,5 @@
 pragma foreign_keys = 0;
+pragma ignore_check_constraints = 1;
 
 begin;
 attach database 'baseball-raw.db' as 'raw';
@@ -15,7 +16,7 @@ CREATE TABLE IF NOT EXISTS main."fielding" (
 	"stint"	NUMERIC,
 	"POS"	TEXT,
 	"G"	NUMERIC,
-	"GS"	NUMERIC,
+	"GS"	NUMERIC check (GS <= G),
 	"InnOuts"	NUMERIC,
 	"PO"	NUMERIC,
 	"A"	NUMERIC,
diff --git a/sql/homegames.sql b/sql/homegames.sql
index 7fc9c0a..1e60b05 100644
--- a/sql/homegames.sql
+++ b/sql/homegames.sql
@@ -20,7 +20,7 @@ CREATE TABLE IF NOT EXISTS main."homegames" (
 	"year"	NUMERIC,
 	"team"	TEXT,
 	"park"	TEXT,
-	"first"	TEXT,
+	"first"	TEXT check(unixepoch("first") <= unixepoch("last")),
 	"last"	TEXT,
 	"games"	NUMERIC,
 	"openings"	NUMERIC,
diff --git a/sql/pitching.sql b/sql/pitching.sql
index 1281cbb..f4054ce 100644
--- a/sql/pitching.sql
+++ b/sql/pitching.sql
@@ -1,4 +1,5 @@
 pragma foreign_keys = 0;
+pragma ignore_check_constraints = 1;
 
 begin;
 attach database 'baseball-raw.db' as 'raw';
@@ -15,14 +16,14 @@ CREATE TABLE IF NOT EXISTS main."pitching" (
 	"stint"	NUMERIC,
 	"W"	NUMERIC,
 	"L"	NUMERIC,
-	"G"	NUMERIC,
-	"GS"	NUMERIC,
-	"CG"	NUMERIC,
-	"SHO"	NUMERIC,
+	"G"	NUMERIC check (W + L + SV <= G),
+	"GS"	NUMERIC check (GS <= G),
+	"CG"	NUMERIC check (CG <= GS),
+	"SHO"	NUMERIC check (SHO <= CG),
 	"SV"	NUMERIC,
 	"IPouts"	NUMERIC,
 	"H"	NUMERIC,
-	"ER"	NUMERIC,
+	"ER"	NUMERIC check (ER <= R),
 	"HR"	NUMERIC,
 	"BB"	NUMERIC,
 	"SO"	NUMERIC,