Efficiently Copying Data Between SQL Server Tables
This guide demonstrates how to duplicate data from one SQL Server table to another. We'll explore methods for copying data, handling differing schemas, and ensuring data integrity.
The simplest approach, suitable for tables with identical structures, involves a direct INSERT
statement:
INSERT INTO targetTable SELECT * FROM sourceTable;
Replace targetTable
with the name of the destination table and sourceTable
with the source table's name.
For tables with different column structures, you must explicitly map the columns:
INSERT INTO targetTable (columnA, columnB, columnC) SELECT columnX, columnY, columnZ FROM sourceTable;
Here, columnA
, columnB
, and columnC
correspond to the columns in targetTable
, and columnX
, columnY
, and columnZ
are their respective counterparts in sourceTable
. Careful attention must be paid to matching data types and order. While omitting the column list in the INSERT
statement is possible if all columns are included in the SELECT
statement and the order matches, explicit column mapping enhances readability and reduces the risk of errors.
Importantly, this INSERT
method adds the copied data to the existing rows in targetTable
; it does not overwrite existing data.
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