摘要:
sql sever默认null最小 ### 升序排序 null值在最前面,若要放在后面,则: ``` order by case when col is null then 1 else 0 end, col ``` ### 降序排序 null值在最后面,若要放在前面,则: ``` order by 阅读全文
posted @ 2023-02-28 16:50
ttttttian
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摘要:
## lag https://spark.apache.org/docs/latest/api/sql/#lag lag(input[, offset[, default]]) OVER (PARTITION BY a ORDER BY b) input - 求lag的目标字段 offset - l 阅读全文
posted @ 2023-02-28 16:40
ttttttian
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