-- MySQL 5.7.21：只读核查关联字段，不查询业务明细。
-- 在 result.txt 对应的业务库执行，返回全部结果集。
SELECT VERSION(), DATABASE(), @@character_set_connection, @@collation_connection;

SELECT TABLE_NAME, COLUMN_NAME, COLUMN_TYPE, IS_NULLABLE,
       CHARACTER_SET_NAME, COLLATION_NAME, COLUMN_KEY
FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA = DATABASE()
  AND (
      (TABLE_NAME = 'negative' AND COLUMN_NAME IN ('id', 'involveDepartId', 'crtTime', 'discoveryTime', 'processing_status', 'checkStatus'))
      OR (TABLE_NAME = 'negative_blame' AND COLUMN_NAME IN ('negativeId', 'blameIdCode', 'type'))
      OR (TABLE_NAME = 'sup_depart' AND COLUMN_NAME IN ('id', 'pid'))
      OR (TABLE_NAME = 'sup_depart_police_size' AND COLUMN_NAME = 'depart_id')
      OR (TABLE_NAME = 'sup_police' AND COLUMN_NAME IN ('id_code', 'org_id', 'del'))
  )
ORDER BY TABLE_NAME, ORDINAL_POSITION;

-- JSON 计划中的 attached_condition 可显示隐式转换，SHOW WARNINGS 紧随 EXPLAIN 执行。
EXPLAIN FORMAT=JSON
SELECT n.id, nb.blameIdCode
FROM negative n
LEFT JOIN negative_blame nb ON nb.negativeId = n.id
WHERE n.crtTime BETWEEN '1949-01-01 00:00:00' AND NOW()
LIMIT 10;
SHOW WARNINGS;

EXPLAIN FORMAT=JSON
SELECT d.id, p.police_size
FROM sup_depart d
LEFT JOIN sup_depart_police_size p ON p.depart_id = d.id
WHERE d.level = 3
LIMIT 10;
SHOW WARNINGS;

EXPLAIN FORMAT=JSON
SELECT d.id
FROM sup_depart d
WHERE d.level = 3 AND EXISTS (
    SELECT 1 FROM negative n
    WHERE n.involveDepartId = d.id
      AND n.crtTime BETWEEN '1949-01-01 00:00:00' AND NOW()
);
SHOW WARNINGS;