数据库行转列

iteye_18341

于 2014-06-12 11:32:01 发布

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分类专栏：行转列文章标签：数据库

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本文深入解析了一段SQL语句，该语句使用了复杂的聚合查询技巧，包括TO_CHAR函数、DECODER函数及GROUP BY操作，旨在展示如何在日期筛选条件下，按组织ID分组并聚合特定站点编号的告诉号。通过分析这段SQL，读者可以学习到在处理数据时如何高效地应用SQL函数来实现业务需求。

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sql语句

select to_char(t.duty_date, 'YYYY-MM-DD') as duty_date,
'441201008' as ORG_ID,
max(decode(t.site_no, '0144004212001', t.teller_no, null)) as a0144004212001,
max(decode(t.site_no, '0144004212002', t.teller_no, null)) as a0144004212002,
max(decode(t.site_no, '0144004212003', t.teller_no, null)) as a0144004212003,
max(decode(t.site_no, '0144004212004', t.teller_no, null)) as a0144004212004,
max(decode(t.site_no, '0144004212005', t.teller_no, null)) as a0144004212005,
max(decode(t.site_no, '0144004212006', t.teller_no, null)) as a0144004212006
from inspect_duty t
where 1 = 1AND t.duty_date >= sysdate
and t.duty_date <= last_day(sysdate)
AND t.org_id = '441201008'
group by t.duty_date
order by t.duty_date