diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9fb09af..a2bb265 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,7 +16,9 @@ jobs:
             # - macOS-latest
             # - windows-latest
         go:
-          - "1.19.1"
+          - "1.19.10"
+          - "1.20.5"
+          - "1.21.0-rc.2"
     services:
       postgres:
         image: postgres:12
@@ -31,31 +33,23 @@ jobs:
         run: |
           psql -U postgres -h localhost -d postgres -c 'CREATE USER dgw_test;'
           psql -U postgres -h localhost -d postgres -c 'CREATE DATABASE dgw_test OWNER dgw_test;'
+      - name: Checkout code
+        uses: actions/checkout/@v3
       - name: Install Go
-        uses: actions/setup-go/@v2
+        uses: actions/setup-go/@v4
         with:
           go-version: ${{ matrix.go }}
-
-      - name: Checkout code
-        uses: actions/checkout/@v3
-
+      - name: Download Go modules
+        shell: bash
+        if: ${{ steps.setup-go.outputs.cache-hit != 'true' }}
+        run: go mod download
       - name: Lint
         uses: golangci/golangci-lint-action@v3
-
       - name: Run test
         run: go test -v
+
   check-test-gen:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os:
-          - ubuntu-latest
-            # Container operations, such as postgres, are only supported on Linux runners
-            # - macOS-latest
-            # - windows-latest
-        go:
-          - "1.19.1"
+    runs-on: ubuntu-latest
     services:
       postgres:
         image: postgres:12
@@ -70,17 +64,21 @@ jobs:
         run: |
           psql -U postgres -h localhost -d postgres -c 'CREATE USER dgw_test;'
           psql -U postgres -h localhost -d postgres -c 'CREATE DATABASE dgw_test OWNER dgw_test;'
-      - name: Install Go
-        uses: actions/setup-go/@v2
-        with:
-          go-version: ${{ matrix.go }}
-
+          psql -U postgres -h localhost -d dgw_test -f ./test.sql
       - name: Checkout code
         uses: actions/checkout/@v3
-
-      - name: Lint
-        uses: golangci/golangci-lint-action@v3
-
+      - name: Install Go
+        uses: actions/setup-go/@v4
+        with:
+          go-version: "1.20.5"
+      - name: Download Go modules
+        shell: bash
+        if: ${{ steps.setup-go.outputs.cache-hit != 'true' }}
+        run: go mod download
+      - name: Install deps
+        run: |
+          go install golang.org/x/tools/cmd/goimports@latest
+          go install
       - name: Generate
         run: go generate -v ./example
       - name: Check diff
diff --git a/example/customstruct.go b/example/customstruct.go
index 4131393..8681055 100644
--- a/example/customstruct.go
+++ b/example/customstruct.go
@@ -133,36 +133,6 @@ func GetT4TableByPk(db Queryer, pk0 int, pk1 int) (*T4, error) {
 	return &r, nil
 }
 
-// T5Table represents public.t5
-type T5Table struct {
-	ID     int64  // id
-	Select int    // select
-	From   string // from
-}
-
-// Create inserts the T5 to the database.
-func (r *T5Table) Create(db Queryer) error {
-	err := db.QueryRow(
-		`INSERT INTO t5 (select, from) VALUES ($1, $2) RETURNING id`,
-		&r.Select, &r.From).Scan(&r.ID)
-	if err != nil {
-		return err
-	}
-	return nil
-}
-
-// GetT5TableByPk select the T5 from the database.
-func GetT5TableByPk(db Queryer, pk0 int64) (*T5, error) {
-	var r T5
-	err := db.QueryRow(
-		`SELECT id, select, from FROM t5 WHERE id = $1`,
-		pk0).Scan(&r.ID, &r.Select, &r.From)
-	if err != nil {
-		return nil, err
-	}
-	return &r, nil
-}
-
 // Queryer database/sql compatible query interface
 type Queryer interface {
 	Exec(string, ...interface{}) (sql.Result, error)
diff --git a/example/defaultstruct.go b/example/defaultstruct.go
index 3eed177..79ea032 100644
--- a/example/defaultstruct.go
+++ b/example/defaultstruct.go
@@ -174,43 +174,3 @@ func GetT4ByPkContext(ctx context.Context, db Queryer, pk0 int, pk1 int) (*T4, e
 	}
 	return &r, nil
 }
-
-// T5 represents public.t5
-type T5 struct {
-	ID     int64  // id
-	Select int    // select
-	From   string // from
-}
-
-// Create inserts the T5 to the database.
-func (r *T5) Create(db Queryer) error {
-	return r.CreateContext(context.Background(), db)
-}
-
-// GetT5ByPk select the T5 from the database.
-func GetT5ByPk(db Queryer, pk0 int64) (*T5, error) {
-	return GetT5ByPkContext(context.Background(), db, pk0)
-}
-
-// CreateContext inserts the T5 to the database.
-func (r *T5) CreateContext(ctx context.Context, db Queryer) error {
-	err := db.QueryRowContext(ctx,
-		`INSERT INTO t5 (select, from) VALUES ($1, $2) RETURNING id`,
-		&r.Select, &r.From).Scan(&r.ID)
-	if err != nil {
-		return errors.Wrap(err, "failed to insert t5")
-	}
-	return nil
-}
-
-// GetT5ByPkContext select the T5 from the database.
-func GetT5ByPkContext(ctx context.Context, db Queryer, pk0 int64) (*T5, error) {
-	var r T5
-	err := db.QueryRowContext(ctx,
-		`SELECT id, select, from FROM t5 WHERE id = $1`,
-		pk0).Scan(&r.ID, &r.Select, &r.From)
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to select t5")
-	}
-	return &r, nil
-}