SQL
`SELECT` Clause
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The [`SELECT` clause](#docs:sql:query_syntax:select) specifies the list of columns that will be returned by the query. While it appears first in the clause, *logically* the expressions here are executed only at the end. The `SELECT` clause can contain arbitrary expressions that transform the output, as well as aggregates and window functions. The `DISTINCT` keyword ensures that only unique tuples are returned.  
> Column names are case-insensitive. See the [Rules for Case Sensitivity](#docs:sql:dialect:keywords_and_identifiers::rules-for-case-sensitivity) for more details.