diff --git a/tests-fuzz/targets/fuzz_create_database.rs b/tests-fuzz/targets/fuzz_create_database.rs
index 0c7129df70..b59ed4fe8e 100644
--- a/tests-fuzz/targets/fuzz_create_database.rs
+++ b/tests-fuzz/targets/fuzz_create_database.rs
@@ -17,7 +17,7 @@
 use common_telemetry::info;
 use libfuzzer_sys::arbitrary::{Arbitrary, Unstructured};
 use libfuzzer_sys::fuzz_target;
-use rand::SeedableRng;
+use rand::{Rng, SeedableRng};
 use rand_chacha::ChaChaRng;
 use snafu::ResultExt;
 use sqlx::{MySql, Pool};
@@ -57,11 +57,13 @@ impl Arbitrary<'_> for FuzzInput {
 
 fn generate_expr(input: FuzzInput) -> Result<CreateDatabaseExpr> {
     let mut rng = ChaChaRng::seed_from_u64(input.seed);
+    let if_not_exists = rng.gen_bool(0.5);
     let create_database_generator = CreateDatabaseExprGeneratorBuilder::default()
         .name_generator(Box::new(MappedGenerator::new(
             WordGenerator,
             merge_two_word_map_fn(random_capitalize_map, uppercase_and_keyword_backtick_map),
         )))
+        .if_not_exists(if_not_exists)
         .build()
         .unwrap();
     create_database_generator.generate(&mut rng)
diff --git a/tests-fuzz/targets/fuzz_create_table.rs b/tests-fuzz/targets/fuzz_create_table.rs
index 3d8bc1db9e..60bcb1628b 100644
--- a/tests-fuzz/targets/fuzz_create_table.rs
+++ b/tests-fuzz/targets/fuzz_create_table.rs
@@ -62,6 +62,7 @@ impl Arbitrary<'_> for FuzzInput {
 fn generate_expr(input: FuzzInput) -> Result<CreateTableExpr> {
     let mut rng = ChaChaRng::seed_from_u64(input.seed);
     let metric_engine = rng.gen_bool(0.5);
+    let if_not_exists = rng.gen_bool(0.5);
     if metric_engine {
         let create_table_generator = CreateTableExprGeneratorBuilder::default()
             .name_generator(Box::new(MappedGenerator::new(
@@ -70,6 +71,7 @@ fn generate_expr(input: FuzzInput) -> Result<CreateTableExpr> {
             )))
             .columns(input.columns)
             .engine("metric")
+            .if_not_exists(if_not_exists)
             .with_clause([("physical_metric_table".to_string(), "".to_string())])
             .build()
             .unwrap();
@@ -82,6 +84,7 @@ fn generate_expr(input: FuzzInput) -> Result<CreateTableExpr> {
             )))
             .columns(input.columns)
             .engine("mito")
+            .if_not_exists(if_not_exists)
             .build()
             .unwrap();
         create_table_generator.generate(&mut rng)