我对JSON数据运行了一个简单的选择查询,其中包含一些简单的计算,但在多次运行时返回不同的结果。我无法找出原因,也没有找到答案。从查询统计信息中可以看到构建了一个临时表,我想这个表在查询完成后未被截断/保存在某个地方,但我无法定位(更不用说截断/删除)该表。这只是一个工作假设 - 答案可能存在于设置或其他方面...有人能找到任何逻辑吗?我在本地实例上使用MySQL Workbench和MySQL DB。MySQL版本为8.0.19 MySQL Community Server-GPL。这是表格的简化版本:
当我运行查询时,我期望看到这个:
有人之前见过这个吗?有解释吗?或者更好的是,有人知道我需要改变什么才能获得一致的结果吗?
CREATE TABLE regulation_entries (
id INTEGER UNSIGNED AUTO_INCREMENT,
employee_id VARCHAR(10) NOT NULL,
regulation JSON NOT NULL,
PRIMARY KEY (id)
);
# Sample data to work with
INSERT INTO regulation_entries VALUES
(DEFAULT, 2, '{"entry_base_salary": "8000", "pension_pct": "0.08"}'),
(DEFAULT, 3, '{"entry_base_salary": "10000", "pension_pct": "0.08"}'),
(DEFAULT, 5, '{"entry_base_salary": "11000", "pension_pct": "0.08"}'),
(DEFAULT, 8, '{"entry_base_salary": "11000", "pension_pct": "0.08"}'),
(DEFAULT, 9, '{"entry_base_salary": "9000", "pension_pct": "0.08"}'),
(DEFAULT, 1, '{"entry_base_salary": "14000", "pension_pct": "0.10"}'),
(DEFAULT, 6, '{"entry_base_salary": "13000", "pension_pct": "0.08"}'),
(DEFAULT, 7, '{"entry_base_salary": "14000", "pension_pct": "0.08"}'),
(DEFAULT, 2, '{"base_salary_adjustment": "500"}'),
(DEFAULT, 9, '{"base_salary_adjustment": "800"}'),
(DEFAULT, 3, '{"base_salary_adjustment": "400"}'),
(DEFAULT, 5, '{"base_salary_adjustment": "350"}'),
(DEFAULT, 8, '{"base_salary_adjustment": "200"}'),
(DEFAULT, 9, '{"base_salary_adjustment": "1250"}'),
(DEFAULT, 1, '{"base_salary_adjustment": "-200"}'),
(DEFAULT, 1, '{"base_salary_adjustment": "50"}'),
(DEFAULT, 6, '{"base_salary_adjustment": "700"}'),
(DEFAULT, 7, '{"base_salary_adjustment": "825"}');
# The query that is bugging me:
SELECT employee_id,
SUM(regulation->>'$.entry_base_salary') AS entry_base_salary,
regulation->>'$.pension_pct' AS pension_pct,
AVG(regulation->>'$.pension_pct') * SUM(regulation->>'$.entry_base_salary') AS entry_pension,
SUM(regulation->>'$.base_salary_adjustment') AS salary_adjustments,
SUM(regulation->>'$.entry_base_salary') + SUM(regulation->>'$.base_salary_adjustment') AS future_salary,
AVG(regulation->>'$.pension_pct') * (SUM(regulation->>'$.entry_base_salary') + SUM(regulation->>'$.base_salary_adjustment')) AS future_pension
FROM sreg.regulation_entries
GROUP BY employee_id
ORDER BY employee_id
当我运行查询时,我期望看到这个:
employee_id #entry_base_salary #pension_pct #entry_pension #salary_adjustments #future_salary #future_pension#
#1 #14000 #0.10 #1400 #1250 #15250 #1525
#2 #8000 #0.08 #640 #1100 #9100 #728
#3 #10000 #0.08 #800 #1000 #11000 #880
#5 #11000 #0.08 #880 #950 #11950 #956
#6 #13000 #0.08 #1040 #1900 #14900 #1192
#7 #14000 #0.08 #1120 #2025 #16025 #1282
#8 #11000 #0.08 #880 #800 #11800 #944
#9 #9000 #0.08 #720 #2650 #11650 #932
但是,如果我再次执行相同的查询,我会得到新的随机结果。例如:
employee_id #entry_base_salary #pension_pct #entry_pension #salary_adjustments #future_salary #future_pension#
1 #14000 #0.10 #1400 #3050 #17050 #1705
2 #8000 #0.08 #640 #2900 #10900 #872
3 #10000 #0.08 #800 #2800 #12800 #1024
5 #11000 #0.08 #880 #2750 #13750 #1100
6 #13000 #0.08 #1040 #3700 #16700 #1336
7 #14000 #0.08 #1120 #3825 #17825 #1426
8 #11000 #0.08 #880 #2600 #13600 #1088
9 #9000 #0.08 #720 #4450 #13450 #1076
Another example
1 #14000 #0.10 #1400 #2.119191149652875e88 #15250 #1525
2 #8000 #0.08 #640 #2.119191149652875e88 #9100 #728
3 #10000 #0.08 #800 #2.119191149652875e88 #11000 #880
5 #11000 #0.08 #880 #2.119191149652875e88 #11950 #956
6 #13000 #0.08 #1040 #2.119191149652875e88 #14900 #1192
7 #14000 #0.08 #1120 #2.119191149652875e88 #16025 #1282
8 #11000 #0.08 #880 #2.119191149652875e88 #11800 #944
9 #9000 #0.08 #720 #2.119191149652875e88 #11650 #932
And a third
1 #14000 #0.10 #1400 #3650 #17650 #1765
2 #8000 #0.08 #640 #3500 #11500 #920
3 #10000 #0.08 #800 #3400 #13400 #1072
5 #11000 #0.08 #880 #3350 #14350 #1148
6 #13000 #0.08 #1040 #4300 #17300 #1384
7 #14000 #0.08 #1120 #4425 #18425 #1474
8 #11000 #0.08 #880 #3200 #14200 #1136
9 #9000 #0.08 #720 #5050 #14050 #1124
有人之前见过这个吗?有解释吗?或者更好的是,有人知道我需要改变什么才能获得一致的结果吗?