gp判斷表是否存在

# 判斷表是否存在 存在返回 1
SELECT
    COUNT(1) as cnt
FROM pg_class c LEFT JOIN pg_namespace n ON (n.oid = c.relnamespace)
WHERE n.nspname = 'open'
AND c.relname = 't_daily_bank_data';

# 檢查某個表是否存在
SELECT
    TABLE_NAME
FROM information_schema.TABLES
WHERE table_schema='open'
AND TABLE_NAME='ads_trans';