- Case Sensitivity in Power BI:
- By default, Power BI is case-insensitive. This means that lowercase letters are treated as identical to uppercase letters.
- For example, “Bonk” is considered the same as “BONK” in Power BI.
- Language-Specific Behavior:
- Different programming languages have varying rules regarding case sensitivity.
- DAX (Data Analysis Expressions), the formula language used in Power BI, is case-insensitive.
- However, the M language (used in Power Query) is case-sensitive, even though it coexists with DAX in the same environment.
- Collation Style:
- If you use Power BI Desktop, Power BI Service, or Azure Analysis Services, string comparison remains case-insensitive.
- However, if you use SQL Server Analysis Services, you can choose between case-sensitive or case-insensitive collation styles.
- Why Case Insensitivity:
- When creating reports, you generally don’t want to distinguish between lowercase and uppercase.
- In databases, strings may be stored in uppercase to avoid distinctions.
- Power BI retains the original casing of strings but ignores it during comparisons.
- For instance, “A” equals “a” and “JOHN” equals “John” even though they’re stored differently.
- Unexpected Results:
- When your tables store a mix of lowercase and uppercase strings, be aware of potential unexpected outcomes.
- Knowing this in advance helps you design your models effectively.
Remember, while case sensitivity can be a complex matter, Power BI’s default choice of case-insensitivity aligns well with reporting needs!
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