data BETWEEN '$data1' AND '$data2' AND empresa = $empresa
$resMovCaixa = mysql_queryBETWEEN '$data1' AND '$data2' AND empresa = $empresa
$resContasPagar = mysql_query($sql,
在执行创建脚本之前,如何检查表是否已经存在?例如在MySQL数据库中,我们可以这样做 IF NOT EXISTS tableName ..then create table sql script to follow 那么在PostgreSQL中呢有没有办法在创建表之前先检查表是否存在?我们该怎么做呢?