Database Statement Execution FunctionsAfter the connection to the database server is successfully established, you can use the functions described in this section to execute SQL queries and commands.PQclearPQexecPQexecParamsPQexecParamsBatchPQexecPreparedPQexecPreparedBatchPQfnamePQgetvaluePQnfieldsPQntuplesPQpreparePQresultStatus