diff --git a/pkg/ccl/backupccl/backup_test.go b/pkg/ccl/backupccl/backup_test.go
index 7d30c7d9a7fc..8572f872e3ff 100644
--- a/pkg/ccl/backupccl/backup_test.go
+++ b/pkg/ccl/backupccl/backup_test.go
@@ -676,7 +676,7 @@ func TestBackupRestoreSystemJobs(t *testing.T) {
 	fullDir := sanitizedFullDir + "moarSecretsHere"
 
 	backupDatabaseID := sqlutils.QueryDatabaseID(t, conn, "data")
-	backupTableID := sqlutils.QueryTableID(t, conn, "data", "bank")
+	backupTableID := sqlutils.QueryTableID(t, conn, "data", "public", "bank")
 
 	sqlDB.Exec(t, `CREATE DATABASE restoredb`)
 	restoreDatabaseID := sqlutils.QueryDatabaseID(t, conn, "restoredb")
@@ -775,7 +775,7 @@ func checkInProgressBackupRestore(
 
 	sqlDB.Exec(t, `CREATE DATABASE restoredb`)
 
-	backupTableID := sqlutils.QueryTableID(t, conn, "data", "bank")
+	backupTableID := sqlutils.QueryTableID(t, conn, "data", "public", "bank")
 
 	do := func(query string, check inProgressChecker) {
 		jobDone := make(chan error)
diff --git a/pkg/ccl/changefeedccl/changefeed_test.go b/pkg/ccl/changefeedccl/changefeed_test.go
index 012529fa0c59..9ab7a69600da 100644
--- a/pkg/ccl/changefeedccl/changefeed_test.go
+++ b/pkg/ccl/changefeedccl/changefeed_test.go
@@ -804,7 +804,7 @@ func fetchDescVersionModificationTime(
 		Key:    tblKey,
 		EndKey: tblKey.PrefixEnd(),
 	}
-	dropColTblID := sqlutils.QueryTableID(t, db, `d`, tableName)
+	dropColTblID := sqlutils.QueryTableID(t, db, `d`, "public", tableName)
 	req := &roachpb.ExportRequest{
 		RequestHeader: header,
 		MVCCFilter:    roachpb.MVCCFilter_All,
diff --git a/pkg/ccl/importccl/load.go b/pkg/ccl/importccl/load.go
index 2b60f5048e25..6a14eb478670 100644
--- a/pkg/ccl/importccl/load.go
+++ b/pkg/ccl/importccl/load.go
@@ -54,12 +54,22 @@ func getDescriptorFromDB(
 	// Due to the namespace migration, the row may not exist in system.namespace
 	// so a fallback to system.namespace_deprecated is required.
 	// TODO(sqlexec): In 20.2, this logic can be removed.
-	for _, tableName := range []string{"system.namespace", "system.namespace_deprecated"} {
-		if err := db.QueryRow(fmt.Sprintf(`SELECT
+	for _, t := range []struct {
+		tableName   string
+		extraClause string
+	}{
+		{"system.namespace", `AND n."parentSchemaID" = 0`},
+		{"system.namespace_deprecated", ""},
+	} {
+		if err := db.QueryRow(
+			fmt.Sprintf(`SELECT
 			d.descriptor
 		FROM %s n INNER JOIN system.descriptor d ON n.id = d.id
-		WHERE n."parentID" = $1
-		AND n.name = $2`, tableName),
+		WHERE n."parentID" = $1 %s
+		AND n.name = $2`,
+				t.tableName,
+				t.extraClause,
+			),
 			keys.RootNamespaceID,
 			dbName,
 		).Scan(&dbDescBytes); err != nil {
diff --git a/pkg/ccl/partitionccl/zone_test.go b/pkg/ccl/partitionccl/zone_test.go
index da85a1d3455e..028eddc0b93b 100644
--- a/pkg/ccl/partitionccl/zone_test.go
+++ b/pkg/ccl/partitionccl/zone_test.go
@@ -53,7 +53,7 @@ func TestValidIndexPartitionSetShowZones(t *testing.T) {
 	partialZoneOverride.GC = &zonepb.GCPolicy{TTLSeconds: 42}
 
 	dbID := sqlutils.QueryDatabaseID(t, db, "d")
-	tableID := sqlutils.QueryTableID(t, db, "d", "t")
+	tableID := sqlutils.QueryTableID(t, db, "d", "public", "t")
 
 	defaultRow := sqlutils.ZoneRow{
 		ID:     keys.RootNamespaceID,
diff --git a/pkg/sql/ambiguous_commit_test.go b/pkg/sql/ambiguous_commit_test.go
index 484f9113a523..765f974dbfc1 100644
--- a/pkg/sql/ambiguous_commit_test.go
+++ b/pkg/sql/ambiguous_commit_test.go
@@ -155,7 +155,7 @@ func TestAmbiguousCommit(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		tableID := sqlutils.QueryTableID(t, sqlDB, "test", "t")
+		tableID := sqlutils.QueryTableID(t, sqlDB, "test", "public", "t")
 		tableStartKey.Store(keys.MakeTablePrefix(tableID))
 
 		// Wait for new table to split & replication.
diff --git a/pkg/sql/privileged_accessor.go b/pkg/sql/privileged_accessor.go
index 135f0840048b..4895a5312e07 100644
--- a/pkg/sql/privileged_accessor.go
+++ b/pkg/sql/privileged_accessor.go
@@ -22,14 +22,23 @@ import (
 )
 
 // LookupNamespaceID implements tree.PrivilegedAccessor.
+// TODO(sqlexec): make this work for any arbitrary schema.
+// This currently only works for public schemas and databases.
 func (p *planner) LookupNamespaceID(
 	ctx context.Context, parentID int64, name string,
 ) (tree.DInt, bool, error) {
 	var r tree.Datums
-	for _, tableName := range []string{"system.namespace", "system.namespace_deprecated"} {
+	for _, t := range []struct {
+		tableName   string
+		extraClause string
+	}{
+		{"system.namespace", `AND "parentSchemaID" IN (0, 29)`},
+		{"system.namespace_deprecated", ""},
+	} {
 		query := fmt.Sprintf(
-			`SELECT id FROM %s WHERE "parentID" = $1 AND name = $2`,
-			tableName,
+			`SELECT id FROM %s WHERE "parentID" = $1 AND name = $2 %s`,
+			t.tableName,
+			t.extraClause,
 		)
 		var err error
 		r, err = p.ExtendedEvalContext().ExecCfg.InternalExecutor.QueryRowEx(
diff --git a/pkg/sql/zone_test.go b/pkg/sql/zone_test.go
index 8d561989b96b..eb5795a2eff4 100644
--- a/pkg/sql/zone_test.go
+++ b/pkg/sql/zone_test.go
@@ -66,7 +66,7 @@ func TestValidSetShowZones(t *testing.T) {
 	}
 
 	dbID := sqlutils.QueryDatabaseID(t, db, "d")
-	tableID := sqlutils.QueryTableID(t, db, "d", "t")
+	tableID := sqlutils.QueryTableID(t, db, "d", "public", "t")
 
 	dbRow := sqlutils.ZoneRow{
 		ID:     dbID,
@@ -246,7 +246,7 @@ func TestZoneInheritField(t *testing.T) {
 	}
 
 	newReplicationFactor := 10
-	tableID := sqlutils.QueryTableID(t, db, "d", "t")
+	tableID := sqlutils.QueryTableID(t, db, "d", "public", "t")
 	newDefCfg := s.(*server.TestServer).Cfg.DefaultZoneConfig
 	newDefCfg.NumReplicas = proto.Int32(int32(newReplicationFactor))
 
diff --git a/pkg/testutils/sqlutils/table_id.go b/pkg/testutils/sqlutils/table_id.go
index 8009d9f5de9a..50bc4cf7d0fd 100644
--- a/pkg/testutils/sqlutils/table_id.go
+++ b/pkg/testutils/sqlutils/table_id.go
@@ -18,7 +18,10 @@ import (
 // QueryDatabaseID returns the database ID of the specified database using the
 // system.namespace table.
 func QueryDatabaseID(t testing.TB, sqlDB DBHandle, dbName string) uint32 {
-	dbIDQuery := `SELECT id FROM system.namespace WHERE name = $1 AND "parentID" = 0`
+	dbIDQuery := `
+		SELECT id FROM system.namespace
+		WHERE name = $1 AND "parentSchemaID" = 0 AND "parentID" = 0
+	`
 	var dbID uint32
 	result := sqlDB.QueryRowContext(context.Background(), dbIDQuery, dbName)
 	if err := result.Scan(&dbID); err != nil {
@@ -29,14 +32,22 @@ func QueryDatabaseID(t testing.TB, sqlDB DBHandle, dbName string) uint32 {
 
 // QueryTableID returns the table ID of the specified database.table
 // using the system.namespace table.
-func QueryTableID(t testing.TB, sqlDB DBHandle, dbName, tableName string) uint32 {
+func QueryTableID(
+	t testing.TB, sqlDB DBHandle, dbName, schemaName string, tableName string,
+) uint32 {
 	tableIDQuery := `
  SELECT tables.id FROM system.namespace tables
    JOIN system.namespace dbs ON dbs.id = tables."parentID"
-   WHERE dbs.name = $1 AND tables.name = $2
+	 JOIN system.namespace schemas ON schemas.id = tables."parentSchemaID"
+   WHERE dbs.name = $1 AND schemas.name = $2 AND tables.name = $3
  `
 	var tableID uint32
-	result := sqlDB.QueryRowContext(context.Background(), tableIDQuery, dbName, tableName)
+	result := sqlDB.QueryRowContext(
+		context.Background(),
+		tableIDQuery, dbName,
+		schemaName,
+		tableName,
+	)
 	if err := result.Scan(&tableID); err != nil {
 		t.Fatal(err)
 	}