mysql> set @v = null; Query OK, 0 rows affected (0.02 sec) mysql> select ifnull(@v,'wc'); +---+ | ifnull(@v,'wc') | +---+ | wc | +---+ 1 row in set (0.01 sec) 3、nullif(xx,yy) :如果xx=yy,则返回null,否则还是返回xx mysql> set @v = 'a'; Query OK, 0 row...
In this SQL tutorial, we have reviewed the SQL (structured query language) functions COALESCE(), ISNULL(), NULLIF() and how these work in SQL Server, Oracle and PostgreSQL. There are also other ways for checking NULL values such as the IS NULL clause and there are other complex functions...
To show the similarity between NULLIF and CASE, the following queries evaluate whether the values in the MakeFlag and FinishedGoodsFlag columns are the same. The first query uses NULLIF. The second query uses the CASE expression.SQL نسخ ...
To show the similarity between NULLIF and CASE, the following queries evaluate whether the values in the MakeFlag and FinishedGoodsFlag columns are the same. The first query uses NULLIF. The second query uses the CASE expression. Copy USE AdventureWorks2008R2; GO SELECT ProductID, MakeFlag, ...
To show the similarity between NULLIF and CASE, the following queries evaluate whether the values in the MakeFlag and FinishedGoodsFlag columns are the same. The first query uses NULLIF. The second query uses the CASE expression. SQL Copy USE AdventureWorks2022; GO SELECT ProductID, MakeFlag,...
SQL Server NULLIFThe NULLIF function in SQL Server accepts two arguments and compares them to determine they are the same or different. If both arguments are equal, it will return a NULL value. If the arguments are not identical, they will return the first argument. We can use this ...
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In a MySQL query, we often practice using the NULLIF() function to stop the division by zero faults. If your MySQL server has enabled ERROR_FOR_DIVISION_BY_ZERO mode, then when a division by zero happens, it will give an error at execution. Consider the SQL statement below to show the...
Defines the number of characters the fragment takes up in the script it was parsed. (Inherited from TSqlFragment) LastTokenIndex Gets or sets the last index of the token. (Inherited from TSqlFragment) ScriptTokenStream Gets or sets the script token stream. (Inherited from TS...
SQL NULLIF ( expression , expression ) 인수 expression 모든 형식의 식입니다. 반환 형식 첫 번째 식과 동일한 형식을 반환합니다. NULLIF는 두 식이 같지 않으면 첫 번째 식을 반환합니다. 식이 같NULLIF...