如何优化太慢 SQL 查询

Question

我需要每周运行一次查询，但这需要很长时间（每次执行大约一小时）。 庞大的信息量使其运行时间很长，但我想知道如何优化它。 我是 SQL 新手。 这是我的要求：

SELECT PRIME_MINISTER.PRIME_MINISTER_ID,
       PRIME_MINISTER.PRIME_MINISTER_NAME,
       CITY.CITY_ID,
       CITY.CITY_POPULATION,
       CITY.CITY_FOUNDATION_DATE,
       STATE.STATE_ID,
       STATE.STATE_NAME,
       CITY_ACCOUNTANT.CITY_ACCOUNTANT_ID,
       CITY_ACCOUNTANT.CITY_ACCOUNTANT_SOCIAL,
       CITY_ACCOUNTANT.CITY_ACCOUNTANT_NAME,
       CITY_COUNCIL.CITY_COUNCIL_ID,
       CITY_COUNCIL.CITY_COUNCIL_FREQUENCY,
       CITY_DEBT.CITY_DEBT_ID,
       CITY_DEBT.CITY_DEBT_NATURE,
       CITY_DEBT.CITY_DEBT_AMOUNT,
       HEAD_OF_STATE.HEAD_OF_STATE_ID,
       HEAD_OF_STATE.HEAD_OF_STATE_SOCIAL,
       DEPUTY_HEAD_OF_STATE.DEPUTY_HEAD_OF_STATE_ID,
       DEPUTY_HEAD_OF_STATE.DEPUTY_HEAD_OF_STATE_SOCIAL,
       DEPUTY_HEAD_OF_STATE.DEPUTY_HEAD_OF_STATE_NAME
FROM CITY
LEFT JOIN CITY_COUNCIL ON CITY.CITY_ID = CITY_COUNCIL.CITY_ID
LEFT JOIN CITY_DEBT ON CITY_COUNCIL.CITY_COUNCIL_ID = CITY_DEBT.CITY_COUNCIL_ID
OR CITY.CITY_ID = CITY_DEBT.CITY_ID
INNER JOIN CITY_ACCOUNTANT ON CITY_ACCOUNTANT.CITY_ACCOUNTANT_ID = CITY.CITY_ACCOUNTANT_ID
INNER JOIN STATE ON STATE.STATE_ID = CITY.STATE_ID
INNER JOIN HEAD_OF_STATE ON HEAD_OF_STATE.HEAD_OF_STATE_ID = STATE.HEAD_OF_STATE_ID
INNER JOIN DEPUTY_HEAD_OF_STATE ON DEPUTY_HEAD_OF_STATE.DEPUTY_HEAD_OF_STATE_ID = HEAD_OF_STATE.DEPUTY_HEAD_OF_STATE_ID
INNER JOIN PRIME_MINISTER ON STATE.STATE_ID = PRIME_MINISTER.STATE_ID
WHERE CITY.CITY_STATUS = 2
  AND CITY.PRIME_MINISTER_STATUS = 2
  AND CITY.JURISDICTION = '70'
  AND CITY.CITY_ACCOUNTANT_NATURE = 'S'
ORDER BY DEPUTY_HEAD_OF_STATE.DEPUTY_HEAD_OF_STATE_ID,
         HEAD_OF_STATE.HEAD_OF_STATE_ID,
         STATE.STATE_ID,
         CITY.CITY_ID,
         CITY_COUNCIL.CITY_COUNCIL_ID,
         CITY_DEBT.CITY_DEBT_ID,
         CITY_ACCOUNTANT.CITY_ACCOUNTANT_ID;

我 select 所有这些数据都在 spring 批处理的读取部分，以便能够将其写入文件中。

这是数据库 model：数据库 Model

该数据库不是我的，所以我不能修改数据库 model 但如果需要我可以创建索引。 每次执行会选择 1,000 到 7,000 行。 所有的列都是必需的。

Answer 1

• CITY_ACCOUTANT中的CITY_ACCOUNTANT与图片中的 CITY_ACCOUNTANT：这是正确的查询还是错字？
• spring 批处理需要一个小时还是只是查询？