diff --git a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLCodeFirst.cs b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLCodeFirst.cs
index 382de62f..854ee076 100644
--- a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLCodeFirst.cs
+++ b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLCodeFirst.cs
@@ -183,7 +183,7 @@ case when a.atttypmod > 0 and a.atttypmod < 32767 then a.atttypmod - 4 else a.at
 case when t.typelem > 0 and t.typinput::varchar = 'array_in' then t2.typname else t.typname end,
 case when a.attnotnull then '0' else '1' end as is_nullable,
 --e.adsrc,
-(select pg_get_expr(adbin, adrelid) from pg_attrdef where adrelid = e.adrelid) is_identity,
+(select pg_get_expr(adbin, adrelid) from pg_attrdef where adrelid = e.adrelid limit 1) is_identity,
 a.attndims,
 d.description as comment
 from pg_class c
diff --git a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLDbFirst.cs b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLDbFirst.cs
index db21a33f..24a12ed9 100644
--- a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLDbFirst.cs
+++ b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLDbFirst.cs
@@ -210,7 +210,7 @@ case when a.atttypmod > 0 and a.atttypmod < 32767 then a.atttypmod - 4 else a.at
 case when t.typelem = 0 then t.typname else t2.typname end,
 case when a.attnotnull then 0 else 1 end as is_nullable,
 --e.adsrc as is_identity, pg12以下
-(select pg_get_expr(adbin, adrelid) from pg_attrdef where adrelid = e.adrelid) is_identity,
+(select pg_get_expr(adbin, adrelid) from pg_attrdef where adrelid = e.adrelid limit 1) is_identity,
 d.description as comment,
 a.attndims,
 case when t.typelem = 0 then t.typtype else t2.typtype end,
diff --git a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs
index ba8f6671..392f55bf 100644
--- a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs
+++ b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLCodeFirst.cs
@@ -218,7 +218,7 @@ case when a.atttypmod > 0 and a.atttypmod < 32767 then a.atttypmod - 4 else a.at
 case when t.typelem > 0 and t.typinput::varchar = 'array_in' then t2.typname else t.typname end,
 case when a.attnotnull then '0' else '1' end as is_nullable,
 --e.adsrc,
-(select pg_get_expr(adbin, adrelid) from pg_attrdef where adrelid = e.adrelid) is_identity,
+(select pg_get_expr(adbin, adrelid) from pg_attrdef where adrelid = e.adrelid limit 1) is_identity,
 a.attndims,
 d.description as comment
 from pg_class c
diff --git a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLDbFirst.cs b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLDbFirst.cs
index 29c93a20..d43cbd83 100644
--- a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLDbFirst.cs
+++ b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLDbFirst.cs
@@ -320,7 +320,7 @@ case when a.atttypmod > 0 and a.atttypmod < 32767 then a.atttypmod - 4 else a.at
 case when t.typelem = 0 then t.typname else t2.typname end,
 case when a.attnotnull then 0 else 1 end as is_nullable,
 --e.adsrc as is_identity, pg12以下
-(select pg_get_expr(adbin, adrelid) from pg_attrdef where adrelid = e.adrelid) is_identity,
+(select pg_get_expr(adbin, adrelid) from pg_attrdef where adrelid = e.adrelid limit 1) is_identity,
 d.description as comment,
 a.attndims,
 case when t.typelem = 0 then t.typtype else t2.typtype end,