MySQL 如何以动态方式删除第一组或最后一组行
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时间：2020-08-31 22:16:30 来源:igfitidea点击:
How do I delete either the first or last set of rows in a dynamic fashion
提问by priya
I would like to delete the first 100 rows or the last 100 rows in a certain table (ordered by the primary key).
我想删除某个表中的前 100 行或最后 100 行（按主键排序）。
Note: Lots of data is being spooled into this table.
注意：大量数据被假脱机到这个表中。
回答by Itay Moav -Malimovka
DELETE FROM table ORDER BY the field DESC|ASC limit 100
回答by Bhavesh Gangani
for first 100,
前 100 名，
DELETE FROM table ORDER BY <field> ASC limit 100
and for last 100,
最后 100 次，
DELETE FROM table ORDER BY <field> DESC limit 100
回答by gbn
SET @first = 1;
delete from mytable
where primKey in (select 1
from myTable
order by
CASE WHEN @first = 1 THEN primKey END ASC,
CASE WHEN @first <> 1 THEN primKey END DESC
limit 100)
