diff --git a/samples/snippets/psql-snippets/add_column.sh b/samples/snippets/psql-snippets/add_column.sh
old mode 100644
new mode 100755
index 080d314ae1..acfff9e104
--- a/samples/snippets/psql-snippets/add_column.sh
+++ b/samples/snippets/psql-snippets/add_column.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 psql -c "ALTER TABLE albums ADD COLUMN marketing_budget bigint"
diff --git a/samples/snippets/psql-snippets/create_connection.sh b/samples/snippets/psql-snippets/create_connection.sh
old mode 100644
new mode 100755
index 0182937a77..8210b891c6
--- a/samples/snippets/psql-snippets/create_connection.sh
+++ b/samples/snippets/psql-snippets/create_connection.sh
@@ -3,9 +3,9 @@
 # Set the connection variables for psql.
 # The following statements use the existing value of the variable if it has
 # already been set, and otherwise assigns a default value.
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 # Connect to Cloud Spanner using psql through PGAdapter
 # and execute a simple query.
diff --git a/samples/snippets/psql-snippets/create_tables.sh b/samples/snippets/psql-snippets/create_tables.sh
old mode 100644
new mode 100755
index 020dfc6e00..e60ac6b56d
--- a/samples/snippets/psql-snippets/create_tables.sh
+++ b/samples/snippets/psql-snippets/create_tables.sh
@@ -3,9 +3,9 @@
 # Set the connection variables for psql.
 # The following statements use the existing value of the variable if it has
 # already been set, and otherwise assigns a default value.
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 # Create two tables in one batch.
 psql << SQL
diff --git a/samples/snippets/psql-snippets/data_boost.sh b/samples/snippets/psql-snippets/data_boost.sh
old mode 100644
new mode 100755
index 6062ff2e87..87ffb86877
--- a/samples/snippets/psql-snippets/data_boost.sh
+++ b/samples/snippets/psql-snippets/data_boost.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 # 'set spanner.data_boost_enabled=true' enables Data Boost for
 # all partitioned queries on this connection.
diff --git a/samples/snippets/psql-snippets/ddl_batch.sh b/samples/snippets/psql-snippets/ddl_batch.sh
old mode 100644
new mode 100755
index b83df784bc..519718086e
--- a/samples/snippets/psql-snippets/ddl_batch.sh
+++ b/samples/snippets/psql-snippets/ddl_batch.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 # Use a single SQL command to batch multiple statements together.
 # Executing multiple DDL statements as one batch is more efficient
diff --git a/samples/snippets/psql-snippets/partitioned_dml.sh b/samples/snippets/psql-snippets/partitioned_dml.sh
old mode 100644
new mode 100755
index b0feb88035..6e3ebc056c
--- a/samples/snippets/psql-snippets/partitioned_dml.sh
+++ b/samples/snippets/psql-snippets/partitioned_dml.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 # Change the DML mode that is used by this connection to Partitioned
 # DML. Partitioned DML is designed for bulk updates and deletes.
diff --git a/samples/snippets/psql-snippets/query_data.sh b/samples/snippets/psql-snippets/query_data.sh
old mode 100644
new mode 100755
index 14ff290f25..8ba8a5408f
--- a/samples/snippets/psql-snippets/query_data.sh
+++ b/samples/snippets/psql-snippets/query_data.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 psql -c "SELECT singer_id, album_id, album_title
          FROM albums"
diff --git a/samples/snippets/psql-snippets/query_data_with_new_column.sh b/samples/snippets/psql-snippets/query_data_with_new_column.sh
new file mode 100755
index 0000000000..e9904777b0
--- /dev/null
+++ b/samples/snippets/psql-snippets/query_data_with_new_column.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
+
+psql -c "SELECT singer_id, album_id, marketing_budget
+         FROM albums
+         ORDER BY singer_id, album_id"
diff --git a/samples/snippets/psql-snippets/query_data_with_parameter.sh b/samples/snippets/psql-snippets/query_data_with_parameter.sh
old mode 100644
new mode 100755
index 81e0d8baf3..d853aa6acf
--- a/samples/snippets/psql-snippets/query_data_with_parameter.sh
+++ b/samples/snippets/psql-snippets/query_data_with_parameter.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 # Create a prepared statement to use a query parameter.
 # Using a prepared statement for executing the same SQL string multiple
diff --git a/samples/snippets/psql-snippets/read_only_transaction.sh b/samples/snippets/psql-snippets/read_only_transaction.sh
old mode 100644
new mode 100755
index 5ad5af8f12..306967d52b
--- a/samples/snippets/psql-snippets/read_only_transaction.sh
+++ b/samples/snippets/psql-snippets/read_only_transaction.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 psql << SQL
   -- Begin a transaction.
diff --git a/samples/snippets/psql-snippets/statement_timeout.sh b/samples/snippets/psql-snippets/statement_timeout.sh
old mode 100644
new mode 100755
index b2a88ec81b..1d690af54d
--- a/samples/snippets/psql-snippets/statement_timeout.sh
+++ b/samples/snippets/psql-snippets/statement_timeout.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 # Set the statement timeout that should be used for all statements
 # on this connection to 5 seconds.
diff --git a/samples/snippets/psql-snippets/tags.sh b/samples/snippets/psql-snippets/tags.sh
old mode 100644
new mode 100755
index 60e84099b0..f97b4fea77
--- a/samples/snippets/psql-snippets/tags.sh
+++ b/samples/snippets/psql-snippets/tags.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 psql << SQL
   -- Start a transaction.
diff --git a/samples/snippets/psql-snippets/update_data_with_copy.sh b/samples/snippets/psql-snippets/update_data_with_copy.sh
old mode 100644
new mode 100755
index b2126c9199..7455b78dbf
--- a/samples/snippets/psql-snippets/update_data_with_copy.sh
+++ b/samples/snippets/psql-snippets/update_data_with_copy.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 # Instruct PGAdapter to use insert-or-update for COPY statements.
 # This enables us to use COPY to update data.
diff --git a/samples/snippets/psql-snippets/update_data_with_transaction.sh b/samples/snippets/psql-snippets/update_data_with_transaction.sh
old mode 100644
new mode 100755
index eaff993d6a..2fb040e9d2
--- a/samples/snippets/psql-snippets/update_data_with_transaction.sh
+++ b/samples/snippets/psql-snippets/update_data_with_transaction.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 psql << SQL
   -- Transfer marketing budget from one album to another.
diff --git a/samples/snippets/psql-snippets/write_data_with_copy.sh b/samples/snippets/psql-snippets/write_data_with_copy.sh
old mode 100644
new mode 100755
index 6d2c65aea2..730277b1a0
--- a/samples/snippets/psql-snippets/write_data_with_copy.sh
+++ b/samples/snippets/psql-snippets/write_data_with_copy.sh
@@ -3,9 +3,9 @@
 # Get the source directory of this script.
 directory=${BASH_SOURCE%/*}/
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 # Copy data to Spanner from a tab-separated text file using the COPY command.
 psql -c "COPY singers (singer_id, first_name, last_name) FROM STDIN" \
diff --git a/samples/snippets/psql-snippets/write_data_with_dml.sh b/samples/snippets/psql-snippets/write_data_with_dml.sh
old mode 100644
new mode 100755
index 13c4506f09..38e6a4350f
--- a/samples/snippets/psql-snippets/write_data_with_dml.sh
+++ b/samples/snippets/psql-snippets/write_data_with_dml.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 psql -c "INSERT INTO singers (singer_id, first_name, last_name) VALUES
                              (12, 'Melissa', 'Garcia'),
diff --git a/samples/snippets/psql-snippets/write_data_with_dml_batch.sh b/samples/snippets/psql-snippets/write_data_with_dml_batch.sh
old mode 100644
new mode 100755
index f08f361478..2c44f17c70
--- a/samples/snippets/psql-snippets/write_data_with_dml_batch.sh
+++ b/samples/snippets/psql-snippets/write_data_with_dml_batch.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
 
-PGHOST="${PGHOST:-localhost}"
-PGPORT="${PGPORT:-5432}"
-PGDATABASE="${PGDATABASE:-example-db}"
+export PGHOST="${PGHOST:-localhost}"
+export PGPORT="${PGPORT:-5432}"
+export PGDATABASE="${PGDATABASE:-example-db}"
 
 # Create a prepared insert statement and execute this prepared
 # insert statement three times in one SQL string. The single