In our case, let's find duplicate values in one columnempnameand to do so, we use the below syntax: SQL Select empname, count(empname) as empname from emp group by empname having count (empname) > 1; Output Duplicate Values in Multiple Columns To identify duplicate values in multiple...
It’s sometimes difficult to know which SQL syntax to use when combining data that spans multiple tables. SQL provides several different statements for performing this type of task; knowing which to apply will yield efficient and correct results. In this article, I’ll discuss some of the more...
You can update multiple columns in SQL for a single record or multiple rows in the table. Let's look at both: Single row update We use the single-row update when modifying values of multiple columns for one specific record. This method is straightforward when altering the values of a parti...
Instead of inserting each customer individually, use multiple row insertion techniques to expedite the process. Solution Let’s look at a query that inserts four new customers: INSERT INTO Customers (CustomerID, Name, Email, Address) VALUES (5, 'John Doe', 'jdoe@email.com', '123 Main St'...
//1. Create sql strings for archiving the PO's in the DB var sql,a,b,c,d,e:string var f:string var i:integer sql:="INSERT INTO PO_history (SimulationID,MU,Number,Name,PO) VALUES" for i := 1 to po_list.ydim --loop a:=to_str(PO_list[1,i]) b:=to_str(PO_list[2,i...
SQL: How to count distinct values with field containing multiple values Hello is there a SQL calc that can count a list of distinct values where each field can have one or more values separated by a ¶? Right now I'm using: ExecuteSQL ("SELECT COUNT (DISTINCT F...
I generally recommend using Parameters but it is also possible to put all of your action queries in a single statement:prettyprint 复制 Public Sub CreateCommand(ByVal connectionString As String) Using connection As New SqlConnection(connectionString) Dim query As String = "INSERT INTO tbl_...
I was wondering whether there is a way to check if LINQ query will be translated to single SQL query/statement or multiple SQL queries/statements when using AsSplitQuery() extension method or QuerySplittingBehavior.SplitQuery option in m...
Adding multiple items to Dictionary Adding multiple rows to a datatable Adding multiple worksheet to Excel using Openxml Adding new columns dynamically Adding results of SQL query to an iEnumerable string adding scrollbar to dropdownlist Adding values inside the datatable to a Dictionary in VB.net ...
I have created an SQL command in Crystal 2008 to joins several of the tables and then added a "UNION" to connect the History and Prod tables. I need to search multiple (3 total) columns for 5 different data types, to return the records being investigated. I tried this using an "OR"...