It works but it also doesn't allow NULL values to be repeated since it's a unique constraint. I want to allow NULL to be repeated. How to do in this constraint? sql sql-server sql-server-2008 t-sql Share Improve this question Follow edited Apr 9, 2016 at 8:05 sqluser 5,6227...
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The commands INSERT SQL and SELECT SQL process null values through the IS NULL and IS NOT NULL clauses. SQL Aggregate functions, such as MAX(), MIN(), and SUM() ignore all null values in the aggregate. Visual FoxPro aggregate functions propagate .NULL. if all supplied values are null va...
I try to add this values to *.cnf file in /etc/mysql/conf.d/ [mysqld] sql_mode=ALLOW_INVALID_DATES,IGNORE_SPACE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION explicit_defaults_for_timestamp=OFF Queries: show variables like 'sql_mode'; show variables like '...
Sharing the bit that you think is not working is not really a help (need to see the bigger picture...also a smaller reproduction of the problem in a smaller sample often leads you discover where you went wrong in my experience).English...
I found the way to bring some null values. It needs some configuration. make config.xml, which should contain some information about MyBatis Config DTD and Settings like below <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD SQL MAP...
table with 50% null values in a column; the null indicators will add 100 bytes to the data and will save 100 bytes of length fields. Every case needs to be examined for alternatives and their impact. Phil Sherman Robert Stearns wrote:[color=blue] ...
COALESCE is one of the tools you have in SQL Server to work with NULL values. It may not be the first one you think of, but it can be a very good choice. In this tip I will provide examples of how you can use COALESCE to peacefully coexist with NULL values. ...
In addition to the space required to store a null value there is also an overhead for having ...
In addition to the space required to store a null value there is also an overhead for having ...