SQL Server Import Excel File Into Temp Table

In this comprehensive guide, I’ll walk you through multiple proven methods to import Excel files into SQL Server temporary tables.

SQL Server Import Excel File Into Temp Table

Before diving into the technical aspects, let me explain why temporary tables are often the preferred destination for Excel imports:

• Data Validation: Temporary tables allow you to validate and clean data before moving it to production tables
• Performance: Processing data in temp tables reduces load on your main database
• Flexibility: You can manipulate imported data without affecting existing structures
• Security: Sensitive data remains isolated during processing

Prerequisites

System Requirements

To successfully import Excel data into SQL Server temporary tables, ensure you have:

• SQL Server 2016 or later (recommended for optimal compatibility)
• SQL Server Management Studio (SSMS)
• Appropriate permissions on the target database
• Excel files in .xlsx or .xls format

Permission Requirements

Method 1: Using SQL Server Import and Export Wizard

The Import and Export Wizard is my go-to method for beginners and one-time imports. This approach provides a user-friendly interface.

Step-by-Step Process

1. Launch the Wizard: Right-click your database in SSMS and select “Tasks” → “Import Data”
2. Configure Data Source:
   • Select “Microsoft Excel” as your data source
   • Browse to your Excel file location
   • Choose the appropriate Excel version
3. Set Destination:
   • Select “SQL Server Native Client” as the destination
   • Configure your server connection details
4. Table Selection:
   • Choose worksheets to import
   • Modify destination table names to include temp table syntax (#TempTableName)

Please refer to the screenshots below for your reference.

Advantages and Limitations

Pros:

• No coding required
• Handles data type mapping automatically
• Visual interface for beginners

Cons:

• Not suitable for automated processes
• Limited customization options
• Requires manual intervention each time

Method 2: Using OPENROWSET with Excel

OPENROWSET provides a more programmatic approach to importing Excel data. This method offers greater control and can be incorporated into stored procedures.

Configuration Requirements

Before using OPENROWSET, ensure these settings are enabled:

-- Enable Ad Hoc Distributed Queries
sp_configure 'show advanced options', 1;
RECONFIGURE;
sp_configure 'Ad Hoc Distributed Queries', 1;
RECONFIGURE;

Implementation Steps

1. Create Temporary Table Structure: First, define your temporary table structure matching your Excel data
2. Use OPENROWSET to Import: Execute the import statement with proper provider configuration
3. Validate and Process: Verify data integrity and perform necessary transformations

Provider Options

Method 3: Converting to CSV and Using BULK INSERT

When dealing with large Excel files or when OLEDB providers aren’t available, converting to CSV and using BULK INSERT often provides the most reliable solution.

Process Overview

1. Excel to CSV Conversion: Save your Excel file as CSV format
2. Create Temporary Table: Define structure matching CSV columns
3. Execute BULK INSERT: Import CSV data into temp table
4. Data Cleanup: Handle formatting issues common with CSV imports

BULK INSERT Advantages

• Performance: Fastest method for large datasets
• Reliability: Less dependent on external providers
• Flexibility: Extensive formatting options available

Method 4: Using SQL Server Integration Services (SSIS)

For enterprise environments requiring automated, scheduled imports, SSIS provides the most robust solution.

SSIS Package Components

Essential Components:

• Excel Source component
• Data Conversion transformations
• OLE DB Destination (configured for temp tables)
• Error handling and logging

Optional Enhancements:

• Conditional Split for data validation
• Derived Column for data transformation
• Script Component for complex business logic

Deployment Considerations

Method 5: PowerShell and SqlBulkCopy

For scenarios requiring programmatic control outside of SQL Server, PowerShell with SqlBulkCopy offers excellent performance and flexibility.

Key Benefits

• Cross-platform compatibility: Works on Windows, Linux, and macOS
• High performance: Optimized for bulk operations
• Scriptable: Easy to integrate into existing automation workflows

Implementation Components

1. Excel Data Reading: Use ImportExcel module or COM objects
2. Data Transformation: Convert to DataTable format
3. Bulk Copy Operation: Transfer to SQL Server temp table

Best Practices

Data Type Considerations

When importing Excel data, pay special attention to data type mapping:

Common Mapping Issues:

• Excel dates may import as text
• Leading zeros in numeric fields get stripped
• Large numbers may lose precision

Recommended Solutions:

• Pre-define temp table structure with appropriate data types
• Use CAST/CONVERT functions during import
• Implement data validation rules

Performance Tips

Based on my experience optimizing imports for companies across the United States:

For Small Files (< 10,000 rows):

• Import/Export Wizard is sufficient
• OPENROWSET provides good performance

For Medium Files (10,000 – 100,000 rows):

• BULK INSERT with CSV conversion
• SSIS packages for repeated operations

for Large Files (> 100,000 rows):

• Always use BULK INSERT or SqlBulkCopy
• Consider partitioning large datasets
• Implement batch processing

Conclusion

Importing Excel files into SQL Server temporary tables is a fundamental skill for any database professional working in today’s data-driven environment.

The key to success lies in choosing the right method for your specific situation: use the Import/Export Wizard for one-time imports, OPENROWSET for programmatic control, BULK INSERT for performance, SSIS for enterprise automation, and PowerShell for cross-platform scenarios.

By following the practices outlined in this guide, you’ll be well-equipped to handle Excel imports efficiently and reliably, contributing to your organization’s data management success.

You may also like the following articles:

• How to Retrieve Data from Temp Table in SQL Server
• How to Create Index on Temp Table in SQL Server
• How To Drop Temp Table If Exists In SQL Server

Bijay Kumar Sahoo

After working for more than 15 years in the Software field, especially in Microsoft technologies, I have decided to share my expert knowledge of SQL Server. Check out all the SQL Server and related database tutorials I have shared here. Most of the readers are from countries like the United States of America, the United Kingdom, New Zealand, Australia, Canada, etc. I am also a Microsoft MVP. Check out more here.