sql - 替换、修剪然后为派生列添加前导 0

Question

我有一个派生列，我从一个字段“BANK_REF”生成，我想从中删除任何破折号和空格，然后用前导 0 填充它，最多 10 个字符。以下处理删除破折号和空格：

REPLACE(TRIM(BANK_REF), "-","")

以下添加是前导 0：

(DT_WSTR,6)REPLICATE("0",6 - LEN(BANK_REF)) + BANK_REF

结合我得到的两者：

(DT_WSTR,6)REPLICATE("0",6 - LEN(REPLACE(TRIM(BANK_REF), "-",""))) + REPLACE(TRIM(BANK_REF), "-","")

这实现了我所追求的，但是它似乎效率低下，因为我复制了替换/修剪部分。有没有更好的方法来实现这一目标？

score 0 · Accepted Answer

You can do it this way:

select right(replicate("0", 10)+REPLACE(TRIM(BANK_REF), "-",""), 10)

I'm not sure if you will notice the difference in efficiency. Generally SQL queries are dominated by I/O rather than in-memory operations.

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