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26 wrz 2024 · CREATE FUNCTION defines a new function. CREATE OR REPLACE FUNCTION will either create a new function, or replace an existing definition. To be able to define a function, the user must have the USAGE privilege on the language. If a schema name is included, then the function is created in the specified schema.
- Create View
Description. CREATE VIEW defines a view of a query. The view...
- Devel
Chętnie wyświetlilibyśmy opis, ale witryna, którą oglądasz,...
- 9. Functions and Operators
PostgreSQL provides a large number of functions and...
- Create View
26 wrz 2024 · PostgreSQL provides four kinds of functions: query language functions (functions written in SQL) (Section 36.5) procedural language functions (functions written in, for example, PL/pgSQL or PL/Tcl) (Section 36.8) internal functions (Section 36.9) C-language functions (Section 36.10)
26 wrz 2024 · PostgreSQL provides a large number of functions and operators for the built-in data types. This chapter describes most of them, although additional special-purpose functions appear in relevant sections of the manual. Users can also define their own functions and operators, as described in Part V.
1 sie 2011 · \sf function_name in psql yields editable source code of a single function. From https://www.postgresql.org/docs/9.6/static/app-psql.html: \sf[+] function_description This command fetches and shows the definition of the named function, in the form of a CREATE OR REPLACE FUNCTION command.
PostgreSQL provides a large number of functions and operators for the built-in data types. This chapter describes most of them, although additional special-purpose functions appear in relevant sections of the manual. Users can also define their own functions and operators, as described in Part V.
Functions can also be defined to return sets of base or composite values. Many kinds of functions can take or return certain pseudo-types (such as polymorphic types), but the available facilities vary. Consult the description of each kind of function for more details. It's easiest to define SQL functions, so we'll start by discussing those.
26 wrz 2024 · Translates a textual function or procedure name (with argument types) to its OID. A similar result is obtained by casting the string to type regprocedure (see Section 8.19); however, this function will return NULL rather than throwing an error if the name is not found. to_regrole ( text) → regrole. Translates a textual role name to its OID.
