this is actually handy

amex-2022-10-20/0_setup/mvp.sh

@@ -0,0 +1,51 @@
+#! /bin/bash
+
+main() {
+   set -e
+   set -o pipefail
+
+   local bin=./0_setup
+   local cmds=(
+      'DROP TABLE IF EXISTS a'
+      'CREATE TABLE a(
+         x INT,
+         y VARCHAR(20),
+         PRIMARY KEY (x)
+      )'
+      'DROP TABLE IF EXISTS b'
+      'CREATE TABLE b(
+         x INT,
+         y VARCHAR(20),
+         PRIMARY KEY (x)
+      )'
+      'SELECT * FROM a'
+      'INSERT INTO a
+         (x, y)
+         VALUES
+         (4, "a")
+      '
+      'SELECT * FROM a'
+      'SELECT * FROM b'
+      'INSERT INTO b
+         (x, y)
+         VALUES
+         (5, "b")
+      '
+      'SELECT * FROM b'
+      'UPDATE b
+         SET x=4
+         WHERE y="b"
+      '
+      'SELECT * FROM b'
+      'SELECT * FROM a JOIN b WHERE a.x == b.x'
+      'SELECT a.y, b.y FROM a JOIN b WHERE a.x == b.x'
+   )
+
+   for cmd in "${cmds[@]}"; do
+      echo =================
+      $bin -q "$cmd"
+      echo
+   done
+}
+
+main "$@"