使用多个条件删除SQL

Question

Some background, I have a code column that is char(6). In this field, I have the values of 0,00,000,0000,000000,000000. It seems illogical but that's how it is. What i need to do is delete all rows that possess these code values. I know how to do it individually as such

delete from [dbo.table] where code='0'
delete from [dbo.table] where code='00'

and so on.

How does one do this one section of code instead of 6

Answer 1

Try this:

delete from [dbo.table] where code='0'
                           or code='00'
                           or code='000'

etc. You get the idea.

There can be more efficient ways when the set of vales gets larger, but your 5 or 6 values is still quite a ways from that.

Update :

If your list grows long, or if your table is significantly larger than can reside in cache, you will likely see a significant performance gain by storing your selection values into an indexed temporary table and joining to it.

Answer 2

It strongly depends on your DBMS, but I suggest to use regular expressions. For example, with MySQL you just need simple query like this:

delete from dbo.table where code regexp '(0+)'

For most of popular DBMS you can do the same, but syntax may be various

Answer 3

I can't test it right now, but the following should work:

DELETE FROM dbo.table WHERE CONVERT(int, code) = 0

edit- Just thought of another way, that should be safer:

DELETE FROM dbo.table WHERE LEN(code) > 0 AND LEFT(code + '0000000000', 10) = '0000000000'