刪除所有行在一定數量後

Question

我有5000行數據。我想在1000年後刪除所有行，我該怎麼做？

Delete from table 
where * 
limit 1000 

這是正確的嗎？

Answer 1

SQL Server

WITH cte 
    AS (SELECT *, 
       row_number() OVER (ORDER BY some_column) AS rn 
     FROM TABLE) 
DELETE FROM cte 
WHERE rn > 1000 

Answer 2

DELETE FROM TABLE 
WHERE ID NOT IN 
(
    SELECT ID FROM TABLE LIMIT 1000 
) 

這個查詢：

1 - 從數據庫

2選擇第1000個記錄 - 刪除所有不在的前100條記錄列表中的記錄

Answer 3

SQL Fiddle

的Oracle 11g R2架構設置：

CREATE TABLE test (A) AS 
SELECT LEVEL 
FROM DUAL 
CONNECT BY LEVEL <= 5000; 

查詢1：

SELECT COUNT(*) FROM test 

Results：

| COUNT(*) | 
|----------| 
|  5000 | 

查詢2：

DELETE FROM test 
WHERE A IN (SELECT A FROM (SELECT A, ROWNUM rn FROM test) WHERE rn > 1000) 

Results：

查詢3：

SELECT COUNT(*) FROM test 

Results：

| COUNT(*) | 
|----------| 
|  1000 |