> For the complete documentation index, see [llms.txt](https://docs.postgresql.tw/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.postgresql.tw/server-programming/spi/spi-interface/spi-spi-register-relation.md).

# SPI\_register\_relation

### SPI\_register\_relation

SPI\_register\_relation — make an ephemeral named relation available by name in SPI queries

### Synopsis

```

int SPI_register_relation(EphemeralNamedRelation enr)
```

### Description

`SPI_register_relation` makes an ephemeral named relation, with associated information, available to queries planned and executed through the current SPI connection.

### Arguments

`EphemeralNamedRelation enr` : the ephemeral named relation registry entry

### Return Value

If the execution of the command was successful then the following (nonnegative) value will be returned:

`SPI_OK_REL_REGISTER` : if the relation has been successfully registered by name

On error, one of the following negative values is returned:

`SPI_ERROR_ARGUMENT` : if *`enr`* is `NULL` or its `name` field is `NULL`

`SPI_ERROR_UNCONNECTED` : if called from an unconnected C function

`SPI_ERROR_REL_DUPLICATE` : if the name specified in the `name` field of *`enr`* is already registered for this connection

***

原文：[PostgreSQL 18.6 Documentation](https://www.postgresql.org/docs/18/spi-spi-register-relation.html)（英文原文，待翻譯）


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