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GHC 10.0.0.20260917 · lts/ghc-10.0.x · 8c2f8e8 · 2026-10-19

Moduleopaleye-0.10.8.0Haskell2010

Opaleye.Exists

  • 1 value
  • Packageopaleye-0.10.8.0
  • Exports1
  • LanguageHaskell2010
  • LicenceBSD-3-Clause
  • SourceExists.hs
valueexists :: Select a -> Select (Field SqlBool)
#

True if any rows are returned by the given query, false otherwise.

This operation is equivalent to Postgres's EXISTS operator.