diff --git a/backend/src/langs.ts b/backend/src/langs.ts
index 385fcc6..30a9d2e 100644
--- a/backend/src/langs.ts
+++ b/backend/src/langs.ts
@@ -1446,8 +1446,12 @@ KTHXBYE
     input: "SELECT 123 * 234;",
     main: "main.sql",
     run: `rm -rf data && /opt/mariadb/scripts/mariadb-install-db --user="$(id -un)" && (/opt/mariadb/bin/mysqld --datadir="$PWD/data" --socket="$PWD/socket" --skip-networking &) && until [[ -e socket ]]; do sleep 0.01; done && (mysql --socket="$PWD/socket" < main.sql; mysql --socket="$PWD/socket")`,
+    lsp: {
+      start: "sqls",
+    },
     template: `SELECT 'Hello, world!';
 `,
+    skip: ["lsp"],
   },
   markdown: {
     aliases: [
@@ -1534,9 +1538,13 @@ message:
     input: "SELECT 123 * 234;",
     main: "main.sql",
     run: `rm -rf data && mysqld -h "$PWD/data" --initialize-insecure && (mysqld -h "$PWD/data" --socket="$PWD/socket" --pid-file="$PWD/pid-file" --mysqlx=OFF --skip-networking &) && until [[ -e socket ]]; do sleep 0.01; done && (mysql --socket="$PWD/socket" -u root < main.sql; mysql --socket="$PWD/socket" -u root)`,
+    lsp: {
+      start: "sqls",
+    },
     template: `SELECT 'Hello, world!';
 `,
     timeout: 15,
+    skip: ["lsp"],
   },
   nim: {
     name: "Nim",
@@ -1741,9 +1749,13 @@ pipi pikachu
     input: "SELECT 123 * 234;",
     main: "main.sql",
     run: `rm -rf data && /usr/lib/postgresql/*/bin/initdb -D data && (echo "listen_addresses = ''" && echo "unix_socket_directories = '.'") >> data/postgresql.conf && /usr/lib/postgresql/*/bin/pg_ctl -D data -w start && (psql -h "$PWD/data" postgres -f main.sql; psql -h "$PWD/data" postgres)`,
+    lsp: {
+      start: "sqls",
+    },
     template: `SELECT 'Hello, world!';
 `,
     timeout: 15,
+    skip: ["lsp"],
   },
   powershell: {
     aliases: ["pwsh", "ps1"],
@@ -2252,8 +2264,12 @@ END
     input: "SELECT 123 * 234;",
     main: "main.sql",
     run: `sqlite3 -cmd "$(< main.sql)"`,
+    lsp: {
+      start: "sqls",
+    },
     template: `SELECT 'Hello, world!';
 `,
+    skip: ["lsp"],
   },
   standardml: {
     aliases: ["sml", "ml"],
diff --git a/scripts/docker-install-phase4.bash b/scripts/docker-install-phase4.bash
index bfed8f2..cce5482 100755
--- a/scripts/docker-install-phase4.bash
+++ b/scripts/docker-install-phase4.bash
@@ -251,6 +251,13 @@ mv "$HOME/.cache/coursier" /opt/coursier/cache
 wget -nv https://setl.org/setl/bin/Linux-x86-64bit/setlbin.tgz
 tar -xf setlbin.tgz -C /usr/local/bin
 
+# SQL
+ver="$(latest_release lighttiger2505/sqls)"
+wget -nv "https://github.com/lighttiger2505/sqls/releases/download/${ver}/sqls-${ver}-linux-amd64.tar.gz"
+tar -xf sqls-*-linux-amd64.tar.gz
+mv linux-amd64/sqls /usr/local/bin/
+rm -rf linux-amd64 sqls-*-linux-amd64.tar.gz
+
 # Swift
 wget -nv https://github.com/raxod502/riju-cdn/releases/download/swift-5.2.4-20.04/swift.tar.gz -O swift.tar.gz
 mkdir /opt/swift