How Can I Handle Case Sensitivity When Creating PostgreSQL Data Views from a Case-Insensitive Database?

PostgreSQL Case Sensitivity and Data Views: A Practical Guide

Migrating data from a case-insensitive database (e.g., MSSQL Server) to PostgreSQL requires careful consideration of PostgreSQL's case-sensitivity rules. PostgreSQL, by default, treats unquoted object names as case-insensitive. However, quoted names are case-sensitive, potentially causing issues when dealing with tables imported with capitalized names.

Here are several approaches to address this challenge when creating PostgreSQL data views:

Method 1: Embrace Quoting

When constructing your data view, enclose the case-sensitive table name in double quotes:

<code class="language-sql">SELECT * FROM "STD_TYPE_CODES";</code>

This explicitly tells PostgreSQL to respect the original case.

Method 2: Lowercase Conversion

Alternatively, you can rename the table to lowercase using ALTER TABLE:

<code class="language-sql">ALTER TABLE "STD_TYPE_CODES" RENAME TO std_type_codes;</code>

This removes the need for quoting, making the table name case-insensitive.

Method 3: Pre-processing the Dump File

If you're working with a database dump, modify the file before importing it into PostgreSQL. This involves converting capitalized table names to lowercase. A text editor or command-line tools like sed can achieve this:

<code class="language-bash">sed -r 's/"[^"]+"/\L/g' dumpfile > new_dumpfile</code>

Important Note:

For consistent case sensitivity management in PostgreSQL, always quote object names (tables, views, etc.) when creating them. This ensures predictable behavior and avoids potential conflicts.

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