From ece6dc420a8fb7700cc506272ac46d82adf670e0 Mon Sep 17 00:00:00 2001
From: Mathias Schneider <mathias.schneider@d-fine.com>
Date: Wed, 17 Jun 2026 08:40:35 +0200
Subject: [PATCH] update

---
 Linux/psql.md | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 Linux/psql.md

diff --git a/Linux/psql.md b/Linux/psql.md
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+Abfrage auf Datenbank Tabelle
+```bash
+psql -U <username> -d <dbname> -c "SELECT * FROM information_schema.tables;"
+```
+.. fragt zB alle Tabellen in DB aus Systemtabelle ab
+### Abfrage in Docker Container
+Finde zuerst Namen des Containers heraus mit
+```bash
+docker ps
+```
+und dann
+```bash
+docker exec -it <container_name> psql -U <username> -d <dbname>
+```
+-> interaktive Session
+oder
+```bash
+docker exec -it <container_name> psql -U <username> -d <dbname> -c "SELECT <fields> FROM <table>;"
+```
+### Export Ergebnisse
+```bash
+docker exec -i <container_name> psql -U <username> -d <dbname> -c "SELECT <fields> FROM <table>;" > path/tp/file.txt
+```
+==WICHTIG==: Option `-i`, NICHT ~~`-it`~~, sonst hängt sich BASH auf
+### Export Ergebnisse als CSV
+```bash
+docker exec -i <container_name> psql -U <username> -d <dbname> -A -F, --csv -c "SELECT <fields> FROM <table>;" > path/tp/file.csv
+```
+Erklärung:
+>The `-A` flag (unaligned output), `-F,` (field separator comma), and `--csv` together produce CSV
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