如何选择几列中的一列等于某个值的行？

Question

Say I have a table that includes column A, column B and column C. How do I write I query that selects all rows where either column A OR column B OR column C equals a certain value? Thanks.

Update: I think forgot to mention my confusion. Say there is another column (column 1) and I need to select based on the following logic:

...where Column1 = '..' AND (ColumnA='..' OR ColumnB='..' OR ColumnC='..')

Is it valid to group statements as I did above with parenthesis to get the desired logic?

Answer 1

除非我在这里遗漏了什么......

SELECT * FROM MYTABLE WHERE COLUMNA=MyValue OR COLUMNB=MyValue OR COLUMNC=MyValue

Answer 2

I prefer this way as its neater

select *
from mytable
where
myvalue in (ColumnA, ColumnB, ColumnC)

Answer 3

SELECT *
FROM myTable
WHERE (Column1 = MyOtherValue) AND
      ((ColumnA = MyValue) OR (ColumnB = MyValue) OR (ColumnC = MyValue))

Answer 4

Yes, it's valid to use parentheses. However, if you're searching multiple columns for the same value, you may want to consider normalizing the database.