Postgresql comment

COMMENT stores a comment about a database object. To remove a comment , write NULL in place of the text string. Comments are automatically dropped when their object is dropped. So in this example, the SQL comment will span across lines within the SQL statement.

Other user interfaces to retrieve comments can be built atop the same built-in functions that psql uses, namely obj_description, col_description, and shobj_description (see Table 8). These block comments nest, as specified in the SQL standard but unlike C, so that one can comment out larger blocks of code that may contain existing block comments. A comment is removed from the input stream before further syntax analysis and is effectively replaced by whitespace. Getting list of table comments in. I asked a similar question about Postgresql comments last month.

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Verwalten Sie Ihr Vermögen richtig. Wir helfen Ihnen dabei. This set of commands is taken from the psql command-line tool. All comments are stored in pg_description.

To get the comments on a table, you need to join it to pg_class. They cannot be added inline, we need to use an additional query in order to generate them. I assume you’ve been given a task that uses psql and you want to learn the absolute minimum to get the job done.

This is both a brief tutorial and a quick reference for the absolute least you need to know about psql. Den Kommentar einer Spalte auf den einer anderen Spalte in Postgresql setzen 2. Peter Andreas Möller. Relationale Datenbanken sind heute eine der gebräuchlichsten Formen der elektronischen Datenspeicherung. Grundlegendes Wissen über die Datenbanksprache SQL ist deshab ein unerlässlicher Bestandteil der Arbeit mit relationalen Datenbanken. Mit der AOK Bayern sind Sie und Ihre Firma auf der sicheren Seite.

Then we will move to the more advanced topics such as how to create tables and users. We will conclude with a review of the functions that are. Comments help us understand what our application code is doing, and database comments provide the equivalent understanding of how things are structured about our data.

The next time you add a column to your database, or write a complex report considering using comments to leave behind some helping guidance for future you. Quite interesting if you need to tune-up a postgres setup. In addition to installing the database, we will install the pgAdmin GUI tool. Once Postgres and pgAdmin are installe we will. That is why we call the action is upsert (update or insert).

These are similar to AUTO_INCREMENT property supported by some other databases. However, you can query the information on columns of a table in a couple of ways. PostgreSQL does not provide the DESCRIBE statement.

In diesem Workshop werden die Möglichkeiten von SQL.