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When a.bid or a.cid is NULL, I want to get every row where the other column matches, e.g. if a.bid is NULL, I want every row where a.cid = b.cid, if both are NULL I want every column from b. My naive solution was this: SELECT DISTINCT b.* FROM b JOIN a ON (ISNULL(a.bid) OR a.bid=b.bid ) AND (ISNULL(a.cid) OR a.cid=b.cid) Is there any better way ...
13 sie 2021 · The following examples show you how a table would get created differently with each of these options, but by default SQL Server sets columns to allow nulls. Example 1. When these two options are OFF the default nullable value is set to no, meaning no null values are acceptable.
4 lis 2016 · One possibility would be the use of nvl in oracle. But I'm not sure how I can achieve the same result as the above. It is the data on the meas_data side which sometimes contains Null for tlsn_vrsn_num and/or tlsn_leg_id, in which case it should ignore those columns for the join.
26 mar 2019 · Since it's not possible to join on NULL values in SQL Server like you might expect, we need to be creative to achieve the results we want. One option is to make our AccountType column NOT NULL and set some other default value. Another option is to create a new column that will act as a surrogate key to join on instead.
10 maj 2024 · When comparing columns that may contain NULL values in a join condition, consider using COALESCE or IS NULL to account for these cases. COALESCE allows you to substitute a non-NULL value for a NULL value, while IS NULL checks for NULL values directly.
15 mar 2022 · select ISNULL (NULL, NULL, 0); select COALESCE (NULL, NULL, NULL, 1); The first statement using the ISNULL function returns 0 and the second statement returns 1. Now let's again perform the join operation with the help of these functions for the null column values and see if we get the expected output.
31 mar 2010 · You need to put your condition into the ON clause of the LEFT JOIN. Select u.first_name, u.last_name, n.status From users u Left Join networks n On ( ( n.user_id = 1 And n.friend_id = u.id ) Or ( n.friend_id = 1 And n.user_id = u.id ) Where u.id <> 1
