獲取與缺少ID排在紅移

我有類似獲取與缺少ID排在紅移

id | name 
---|----- 
1 | Sarah 
3 | Pat 
4 | Lea

我正在尋找丟失的行。我試過使用generate_series和左連接，但這是你在Redshift中無法做到的事情，因爲generate_series不受支持。

是否有可能沒有臨時表呢？

編輯

最後沒with a temporary table（0至1_000_000）看到答案。

來源

2016-12-15 Mio

您需要臨時表或子查詢。因爲你需要一些東西來告訴你什麼是全套，知道什麼是缺少的。所以答案是***沒有***。 –

這可能有助於http://stackoverflow.com/questions/17282276/using-sql-function-generate-series-in-redshift –

你怎麼知道哪一行是「丟失」？ –

這可能不是最優的。但這是我的做法

-- create temporary table 
CREATE TABLE series (id INT) SORTKEY(id); 

-- insert 0 to 1_000_000 
INSERT INTO series WITH seq_0_9 AS 
(SELECT 0 AS num 
UNION ALL SELECT 1 AS num 
UNION ALL SELECT 2 AS num 
UNION ALL SELECT 3 AS num 
UNION ALL SELECT 4 AS num 
UNION ALL SELECT 5 AS num 
UNION ALL SELECT 6 AS num 
UNION ALL SELECT 7 AS num 
UNION ALL SELECT 8 AS num 
UNION ALL SELECT 9 AS num), 
        seq_0_999 AS 
(SELECT a.num + b.num * 10 + c.num * 100 AS num 
FROM seq_0_9 a, 
    seq_0_9 b, 
    seq_0_9 c) 
SELECT a.num + b.num * 1000 AS num 
FROM seq_0_999 a, 
seq_0_999 b 
ORDER BY num; 

-- Why not 
VACUUM series; 

-- LEFT OUTER JOIN with table inverted and with the interval 
SELECT * 
FROM series 
LEFT OUTER JOIN other_table ON series.id = other_table.id 
WHERE series.id BETWEEN 0 AND 4 
ORDER BY series.id;

來源

2016-12-15 17:07:44 Mio

獲取與缺少ID排在紅移

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