The `CONTAINSSTRING` and `CONTAINSSTRINGEXACT` functions represent a boolean pattern-matching mechanism within Domain-Specific Query languages (DSQL) for Power BI, functioning as the native equivalent to SQL's `LIKE` operator but optimized with distinct case-sensitivity constraints. The core theory distinguishes between substring location detection (`SEARCH`, `FIND`) which returns positional indices and requires additional computation versus boolean existence checks that return immediate true/false states based on specific text manipulation rules involving wildcards (*, ?). This concept operates within the domain of Data Analysis Expressions (DAX) to facilitate dynamic filtering and aggregation strategies by evaluating whether a target string exists as a sub-pattern within an evaluated column.
The `CONTAINSSTRING` and `CONTAINSSTRINGEXACT` functions represent a boolean pattern-matching mechanism within Domain-Specific Query languages (DSQL) for Power BI, functioning as the native equivalen…