Oracle PL/SQL: Errors and warnings

Three categories of warnings

Which of these warnings are reported is controlled by the value of the init parameter plsql_warnings.

`PLS-00103: Encountered the symbol "…" when expecting one of the following: …`
`PLS-00174: a static boolean expression must be used`
`PLS-00201: identifier … must be declared`
`PLS-00215: String length constraints must be in range (1 .. 32767)`
`PLS-00157: Only schema-level programs allow AUTHID`

`PLW-05004: identifier … is also declared in STANDARD or is a SQL builtin`
`PLW-05005: subprogram … returns without value at line …`
`PLW-05011: pragma INLINE for procedure '…' does not apply to any calls`
`PLW-05018: unit … omitted optional AUTHID clause; default value DEFINER used`
`PLW-06002: Unreachable code`
`PLW-06003: unknown inquiry directive '$$…'`
`PLW-06006: uncalled procedure "…" is removed.`
`PLW-06009: procedure "…" OTHERS handler does not end in RAISE or RAISE_APPLICATION_ERROR`
`PLW-06010: keyword "…" used as a defined name`
`PLW-06026: package specification exposes global variable …`
`PLW-07203: parameter '…' may benefit from use of the NOCOPY compiler hint`
`PLW-07204: conversion away from column type may result in sub-optimal query plan`
`PLW-07206: analysis suggests that the assignment to '…' may be unnecessary`