自我外部连接 就用前面那个员工表的例子来说,就是用LEFT JOIN让得到的 员工-上级 合并表也包括老板本人(老板没有上级,即 reports_to 字段为空,如果用 JOIN 会被筛掉,用 LEFT JOIN 才能保留) USE sql_hr; SELECT e.employee_id, e.first_name, m.first_nameAS manager FROM employees e LEFTJOIN em...
If any of the concatenated columns have NULL values, the string concatenation using the plus operator returns NULL or an empty string. In the screenshot below we can see we have a NULL value in the [AddressLine2] column, therefore the string concatenate returns NULL in the [Address] column...
Concatenate SQL Server Column Values with CONCAT Function The next set of code is using the newCONCAT()function that is in SQL Server 2012 and later versions with aSELECT statement. It replaces NULL values with an empty string of type VARCHAR(1). This SQL statement is much easier to read ...
The CONCAT() function can be used to database table's columns. The following join the FirstName column, a string with white space, and the LastName column of the Employee table. Example: CONCAT() Copy SELECT CONCAT(emp.FirstName,' ' , emp.LastName) as EmployeeName; FROM Employee emp;...
A. Using the concat() XQuery function to concatenate strings For a specific product model, this query returns a string created by concatenating the warranty period and warranty description. In the catalog description document, the <Warranty> element is made up of <WarrantyPeriod> and <Description...
Is there a SQL command to concatenate column results? Here's what I mean - I have SQL that produces this: SUBSCRIBER LOCATION DESCRIPTION --- --- --- 2017 327 Infrastructure 2017 327 Internet Basic 2017 327 Video Basic Since the subscriber and location are the same, it would be great t...
In the previous section, we explored that if we want to concatenate string using + operator and any of string has a NULL value, and we get the output as NULL. We use SQL ISNULL function to replace NULL values in the string. We need to use SQL ISNULL with each column containing NULL...
Check constraints or partition function of source table ALTER TABLE with variable TableName ALTER vs UPDATE when creating a new column with default value. Alternate queries for MERGE Alternative for OR in WHERE clause Alternative for PIVOT Alternative of CURSOR in SQL to improve performance ?
Concatenate Dynamic Columns function mymap() { const ss = SpreadsheetApp.getActive(); const sh = ss.getActiveSheet(); const rg = sh.getRange(2, 1, sh.getLastRow() - 1, sh.getLastColumn()); const vs = rg.getDisplayValues(); rg.clearContent(); let vo = vs.map((r => { let...
SQLPutData allows an application to send data for a parameter or column to the driver at statement execution time. This function can be used to send character or binary data values in parts to a column with a character, binary, or data source-specific data type (for example, parameters of...