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20 lis 2017 · You can get rid of that line by changing either (or both) of those two aforementioned options: either uncheck "Include column headers in the result set" and/or set "Output format" to "comma delimited".
Can anyone point out how to check if a select query returns non empty result set? For example I have next query: SELECT * FROM service s WHERE s.service_id = ?; Should I do something like next: ISNULL(SELECT * FROM service s WHERE s.service_id = ?) to test if result set is not empty?
6 cze 2024 · MS SQL provides a function ISNULL to check for null values: SELECT id, name FROM Department WHERE ISNULL (code, '') = '' OR TRIM (code) = ''; The ISNULL function in MS SQL takes two arguments: the first is a value or column name, and the second is the default value if the first argument is null.
31 sty 2018 · My subquery is returning one row and hence compared to 1. This leads my CASE WHEN to produce the 1 output. Even if I set the subquery to return no rows like the sample below, the CASE statement returns the 0 result: SELECT. CASE WHEN (SELECT 1 WHERE (1=0)) = 1 THEN 1 ELSE 0 END.
18 cze 2019 · Writing queries to a database requires knowledge about SQL syntax, but this is not all you should know. Best practices for writing professional SQL code require good formatting skills. In this article I discuss why this is so important and what are the basic rules you should follow.
19 maj 2021 · Due to this structure of the NULL values, it is not possible to use traditional comparison (=, <, > and <>) operators in the queries. As a matter of fact, in the SQL Standards using the WHERE clause as the below will lead to return empty result sets.
4 sty 2011 · You set a varchar2 to an empty string like this: Update mytable set varchar_col = ''; the following leads to the same result. Update mytable set varchar_col = NULL; But to select the columns where the value is empty or NULL, you have to use. select * from mytable where varchar_col is NULL; Using . select * from mytable where varchar_col = '';
