diff --git a/.gitignore b/.gitignore
index 94edd71..3242097 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 *.sw?
 public/*
+tags
diff --git a/content/research/psql.md b/content/research/psql.md
new file mode 100644
index 0000000..a1c0166
--- /dev/null
+++ b/content/research/psql.md
@@ -0,0 +1,9 @@
++++
+title = "psql"
+weight = 112
++++
+
+- [Show databases](@/research/psql/show-database.md)
+- [Use database](@/research/psql/use-database.md)
+- [Show schemas](@/research/psql/show-schemas.md)
+- [Show tables](@/research/psql/show-tables.md)
diff --git a/content/research/psql/show-database.md b/content/research/psql/show-database.md
new file mode 100644
index 0000000..5d20eaa
--- /dev/null
+++ b/content/research/psql/show-database.md
@@ -0,0 +1,10 @@
++++
+title = "PSQL: Show database"
+
+[taxonomies]
+tags = ["research", "postgresql", "psql", "database"]
++++
+
+```
+\dt
+```
diff --git a/content/research/psql/show-schemas.md b/content/research/psql/show-schemas.md
new file mode 100644
index 0000000..7d19902
--- /dev/null
+++ b/content/research/psql/show-schemas.md
@@ -0,0 +1,10 @@
++++
+title = "PSQL: Show Schemas"
+
+[taxonomies]
+tags = ["research", "postgresql", "psql", "schemas"]
++++
+
+```
+\dn
+```
diff --git a/content/research/psql/show-tables.md b/content/research/psql/show-tables.md
new file mode 100644
index 0000000..7d5e253
--- /dev/null
+++ b/content/research/psql/show-tables.md
@@ -0,0 +1,10 @@
++++
+title = "PSQL: Show Tables"
+
+[taxonomies]
+tags = ["research", "postgresql", "psql", "tables"]
++++
+
+```
+\dt
+```
diff --git a/content/research/psql/use-database.md b/content/research/psql/use-database.md
new file mode 100644
index 0000000..6950659
--- /dev/null
+++ b/content/research/psql/use-database.md
@@ -0,0 +1,10 @@
++++
+title = "PSQL: Use Database"
+
+[taxonomies]
+tags = ["research", "postgresql", "psql", "database"]
++++
+
+```
+\c [database_name]
+```