Mar 21, 2016 · select t.*, 'value' as col into #temp1 from #temp t; However, for an existing table, there is no way to add a column and populate it at the same time -- except for providing a default value. You can, however, add multiple columns at the same time: alter #temp add col1 int, col2 int, col3 int; update #temp t set col1 = 1, col2 = 2, col3 = 3;

Aug 22, 2012 · ALTER TABLE tablename ADD COLUMN colname varchar; UPDATE tablename SET colname = ( CASE WHEN othercol < 0 THEN 'Credit' ELSE 'Debit' END ); Think carefully about whether zero should be 'Debit' or 'Credit' and adjust the CASE accordingly. For rounding, use round(amount,2).

Jun 22, 2010 · I'm rusty on SQL but I think you could use select as to make your own temporary query columns. select field1, field2, 'example' as newfield from table1 That would only exist in your query results, of course. You're not actually modifying the table.

Apr 13, 2024 · In this article I will guide you through the process of constructing a temp table in SQL by employing simple yet powerful techniques. To create a temp table in SQL, you can use the CREATE TEMPORARY TABLE statement, specifying the table’s structure and data types for …

Adding Identity Column into #Temp Table: CREATE TABLE #tmp ( ID INT IDENTITY ( 1 , 1 ), Col1 nvarchar ( 100 ), Col2 int ) Or you can later add it by using the ALTER statement

Adding Columns in #Temp table dynamically. Temp tables allow changes to their structure when required after creation. DECLARE @ColName nvarchar(100) DECLARE @DynamicSQL nvarchar(250) SET @ColName='newColumn' SET @DynamicSQL = 'ALTER TABLE #Mytemp ADD ['+ CAST(@ColName AS NVARCHAR(100)) +'] NVARCHAR(100) NULL' EXEC(@DynamicSQL)

Apr 25, 2025 · When you need to add a new column to an existing temp table, you can use the following SQL syntax: ALTER TABLE temp_table_name ADD new_column_name data_type; For example, if you have a temp table named temp_sales and you want to add a column for discount, you would execute: ALTER TABLE temp_sales ADD discount DECIMAL(5, 2);

Aug 15, 2019 · The best way I’ve found to do this is to use that output to generate an ALTER TABLE to add the correct columns and data types. Here’s a dummy stored procedure that does it:

May 31, 2023 · In this example, the temporary table temp_table has three columns: id of type INT, name of type VARCHAR(50), and age of type INT. We can add more columns as needed, specifying the column name followed by the data type.

Mar 16, 2016 · You can simply create a static temp table and then dynamically change it’s columns. This includes adding and removing columns dynamically. Below is sample T-SQL to illustrate this trick.