Search results
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 · In most cases your columns in your tables probably allow NULL values unless you consciously changed them when you created a table or changed the default setting for your database by using the SET ANSI_NULL_DEFAULT OFF and SET ANSI_NULL_DFLT_ON OFF option.
26 mar 2019 · Joining on NULLs. 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.
24 paź 2024 · NULL and JOIN. You have to remember about NULL when using JOIN, especially with OUTER JOINs like LEFT JOIN or FULL JOIN. There can be NULLs in columns coming from the right table. Imagine we have another table, comments, that contains data about post comments. It has information in the following columns: id – A unique identifier for each comment.
15 mar 2022 · There are ways to join on NULL values, one of which is making those columns NOT NULL and adding default values to them. But what if, we don't have access or permission to change the table structure in the database?
18 paź 2017 · WHERE ((Destination.ColumnA = Source.ColumnA) OR (Destination.ColumnA IS NULL AND Source.ColumnA IS NULL)) AND ... -- other column comparisons This will provide a workaround that effectively equates a NULL in one column to a NULL in another.
9 lis 2015 · LEFT JOIN TABLE2 ON TABLE2.COLUMNA = TABLE1.STATE. LEFT JOIN TABLE3 ON TABLE3.COLUMNZ = TABLE1.STATE. TABLE1.CITY, TABLE1.STATE, MAX(CASE WHEN TABLE2.COLUMNA IS NULL THEN 0 ELSE 1 END) AS IS_TRUE, MAX(CASE WHEN TABLE3.COLUMNZ IS NULL THEN 0 ELSE 1 END) AS IS_STUFF. TABLE1. LEFT JOIN TABLE2 ON TABLE2.COLUMNA = TABLE1.STATE.
