问如何在SparkSQL中模拟ZEROIFNULL的功能EN笔者开源了一个Web思维导图mind-map，最近在优化背景图片效果的时候遇到了一个问题，页面上展示时背景图片是通过css使用background-image渲染的，而导出的时候实际上是绘制到canvas上导出的，那么就会有个问题，css的背景图片支持比较丰富的效果，比如通过backg
ZEROIFNULL(expression) Parameters expression String to evaluate for NULL values, one of the following data types: INTEGER DOUBLE PRECISION INTERVAL NUMERIC Examples The following query returns scores for five students from tabletest_results, whereScoreis set to 0 for L. White, and null for S. R...
The EQUAL_NULL function is also one of the Snowflake functions missing in SQL Server. This function compares two arguments and returns TRUE if they are equal and FALSE if not. Unlike regular equality operations, EQUAL_NULL is NULL-safe which means it considers NULLs as equal. Therefor...
if(boolean condition, type ifTrue, type ifFalseOrNull) For example; select if(1=1,'TRUE','FALSE') as IF_TEST; Impala CASE Conditional Function This function Tests whether any of a sequence of expressions is true, and returns a corresponding result for the first true expression. You can ...