Using Distinct in SQL Update

问题

Here is the Select I need to convert to an Update:

SELECT DISTINCT f.SectionID, f.Name, v.Enabled
FROM SETTING_VALUE v
INNER JOIN SETTING s ON v.SettingID = s.SettingID
INNER JOIN LU_FIELD f ON f.FieldID = s.FieldID
WHERE v.DisplayValue LIKE '%Miami%'
AND f.ControlName LIKE '%City%'

My attempt:

UPDATE SETTING_VALUE
SET Enabled = 0
FROM SETTING_VALUE v
INNER JOIN SETTING s ON v.SettingID = s.SettingID
INNER JOIN LU_FIELD f ON f.FieldID = s.FieldID
WHERE v.DisplayValue LIKE '%Miami%'
AND f.ControlName LIKE '%City%'

Not sure how to apply Distinct

回答1:

Based on your comment, all of the matching rows should be updated you don't need distinct. Just execute this:

UPDATE SETTING_VALUE
SET Enabled = 0
FROM SETTING_VALUE v
INNER JOIN SETTING s ON v.SettingID = s.SettingID
INNER JOIN LU_FIELD f ON f.FieldID = s.FieldID
WHERE v.DisplayValue LIKE '%Miami%'
AND f.ControlName LIKE '%City%'

Everything that you saw in your select will be updated.

回答2:

Option 1: Use a temporary table to hold your initial query results, then update based on the query results.

Option 2:

Insert into SETTING_VALUE
(SectionID, Name, Enabled)
SELECT DISTINCT f.SectionID, f.Name, v.Enabled
FROM SETTING_VALUE v
INNER JOIN SETTING s ON v.SettingID = s.SettingID
INNER JOIN LU_FIELD f ON f.FieldID = s.FieldID
WHERE v.DisplayValue LIKE '%Miami%'
AND f.ControlName LIKE '%City%'

回答3:

UPDATE SETTING_VALUE
   SET Enabled = 0
 WHERE DisplayValue LIKE '%Miami%'
       AND EXISTS (
                   SELECT *
                     FROM SETTING s 
                    WHERE SETTING_VALUE.SettingID = s.SettingID
                          AND EXISTS (
                                      SELECT *
                                        FROM LU_FIELD f 
                                       WHERE f.FieldID = s.FieldID
                                             AND f.ControlName LIKE '%City%'
                                     )
                  );

回答4:

You can try the following

UPDATE v
SET Enabled = 0 
FROM SETTING_VALUE v 
WHERE EXISTS(
   select * from SETTING s 
   INNER JOIN LU_FIELD f ON f.FieldID = s.FieldID 
   WHERE v.DisplayValue LIKE '%Miami%' 
   AND f.ControlName LIKE '%City%' 
   AND v.SettingID = s.SettingID
)

来源：https://stackoverflow.com/questions/7163271/using-distinct-in-sql-update

标签

sql

sql-server

sql-update

distinct