var c = a.Concat(b.DefaultIfEmpty()); is "a","b", null because with DefaultIfEmpty you asked to return a singleton list with the default value for its element type (and the default value for a string is null) var c = a.Concat(b.DefaultIfEmpty("z")); would return the "a", "...
(System.Convert.IsDbNull(ds.Tables[1].Rows[i]["Question"])) { // some data exists int myquestion = (int)ds.Tables[1].Rows[i]["Question"]; } // do the same for the answers as well //int myanswer = (int)ds.Tables[1].Rows[i]["Answer"]...
For example when we wanted to check all objects with a null expiryTime, we can search for all objects with an expiryTime of absolute out of range value, lets say >= ‘1900/01/01’ and then negate the result set to find all objects with a null value. The XPath query w...
This tutorial describes how to use Atlas Search queries to check your data for null or non-null values. It takes you through the following steps: Load sample documents with null values and missing fields into the sample_mflix.users collection. Set up an Atlas Search index with dynamic mapping...
How to check for null/empty/whitespace values with a single test? SELECTcolumn_nameFROMtable_nameWHERETRIM(column_name)ISNULL
How to check the dropdown selected value is null or not. Iam using the following code , if(input.dropdown!=null && input.dropdown!=""),But this is not working for me. EX;if(input.dropdown=="Some value") show "Some value" else if(input.dropdo
IF l_UserID IS NULL SELECT FirstName, LastName, EMail FROM Users WHERE UserID = l_UserID; END The problem is in how to acheive the same as IF UserID <> NULL in MYSQL? Thanks in advance? --- NC Subject Written By Posted
How to check if a variable is not null? I know that below are the two ways in JavaScript to check whether a variable is notnull, but I’m confused which is the best practice to use. Should I do: if(myVar) {...} or if(myVar !==null) {...} ...
Check whether the URL entered in the browser is correct. If not, enter the correct URLhttps://192.168.1.1. Check whether the PC and AR router can ping each other successfully. On the CLI of the PC, Run theping 192.168.1.1command to check whether the PC can ping the AR router successfu...
(note the embedded space), "10 .3" (note the embedded space), "10e1" (float.TryParseworks here), and so on. A string whose value isnullorString.Emptyfails to parse successfully. You can check for a null or empty string before attempting to parse it by calling theString.IsNullOrEmpty...