diff --git a/apps/api/src/routes/contest.ts b/apps/api/src/routes/contest.ts
index d64462f..4d15a17 100644
--- a/apps/api/src/routes/contest.ts
+++ b/apps/api/src/routes/contest.ts
@@ -244,6 +244,7 @@ contestRoutes.get(
             allowFlowchart: problem.allowFlowchart,
             showFlowchart: problem.showFlowchart,
             hasAstRules: problem.astRules !== null,
+            isSql: problem.languages.includes("SQL"),
             myStatus: myStatusOf(statuses, problem.id),
             // 按人数是公开题库列表的列；比赛题表看的是榜单，不下发
             solvedUsers: 0,
diff --git a/apps/api/src/routes/problem.ts b/apps/api/src/routes/problem.ts
index c362900..8f92857 100644
--- a/apps/api/src/routes/problem.ts
+++ b/apps/api/src/routes/problem.ts
@@ -110,6 +110,7 @@ function listItem(
     allowFlowchart: row.problem.allowFlowchart,
     showFlowchart: row.problem.showFlowchart,
     hasAstRules: row.problem.astRules !== null,
+    isSql: row.problem.languages.includes("SQL"),
     // 流程图评到 A / S 也打勾：problemStates 已经把它算进 solved
     myStatus: states?.solved.has(id)
       ? JudgeStatus.ACCEPTED
@@ -157,6 +158,7 @@ problemRoutes.get("/problems", optionalAuth, async (c) => {
   if (type === "reference") filters.push(eq(schema.problem.showFlowchart, true))
   if (type === "flowchart") filters.push(eq(schema.problem.allowFlowchart, true))
   if (type === "ast") filters.push(sql`${schema.problem.astRules} is not null`)
+  if (type === "sql") filters.push(sql`${schema.problem.languages} @> '["SQL"]'::jsonb`)
 
   const states = user ? await problemStates(user.id) : null
   if (undone && states && states.solved.size > 0)
diff --git a/apps/web/src/oj/problem/components/ProblemTypeTag.vue b/apps/web/src/oj/problem/components/ProblemTypeTag.vue
index f042ccb..75964f0 100644
--- a/apps/web/src/oj/problem/components/ProblemTypeTag.vue
+++ b/apps/web/src/oj/problem/components/ProblemTypeTag.vue
@@ -5,7 +5,8 @@ import { useThemeVars } from "naive-ui"
 import { PROBLEM_TYPE_LABEL } from "../utils/problemType"
 
 /**
- * 三类特殊题的小标签（设计稿「题目列表重设计 · 改版」）。轻重按对学生意味着什么分：
+ * 几类特殊题的小标签（设计稿「题目列表重设计 · 改版」）。轻重按对学生意味着什么分：
+ * - SQL：和画流程图一样重（实心底）—— 写的根本不是 C / Python，点进去之前就得知道
  * - 画流程图：最醒目（浅紫底）—— 只有这类题能交流程图，要做的事和普通题不一样
  * - 语法要求：蓝描边 —— 判题时会检查写法，要看得见
  * - 有参考图：灰描边，最轻 —— 是帮助，不用提醒
@@ -16,6 +17,7 @@ const props = defineProps<{ kind: ProblemTypeFilter }>()
 const theme = useThemeVars()
 
 const ICON: Record<ProblemTypeFilter, string> = {
+  sql: "ph:database-bold",
   flowchart: "ph:pencil-simple-line-bold",
   ast: "ph:code-bold",
   reference: "ph:flow-arrow-bold",
@@ -67,12 +69,38 @@ html.dark .type-tag.flowchart {
   background: rgba(160, 120, 240, 0.18);
 }
 
+/* 青色：绿 / 橙 / 红是难度、紫是画流程图、蓝是语法要求，剩下它不和谁撞 */
+.type-tag.sql {
+  font-weight: 600;
+  color: #0b6470;
+  background: #dcf1f3;
+  border-color: transparent;
+}
+
+html.dark .type-tag.sql {
+  color: #8fd8e0;
+  background: rgba(60, 180, 195, 0.18);
+}
+
 .type-tag.ast {
   color: var(--tag-info);
   border-color: #b9cdee;
 }
 
-html.dark .type-tag.ast {
+html.dark /* 青色：绿 / 橙 / 红是难度、紫是画流程图、蓝是语法要求，剩下它不和谁撞 */
+.type-tag.sql {
+  font-weight: 600;
+  color: #0b6470;
+  background: #dcf1f3;
+  border-color: transparent;
+}
+
+html.dark .type-tag.sql {
+  color: #8fd8e0;
+  background: rgba(60, 180, 195, 0.18);
+}
+
+.type-tag.ast {
   color: var(--tag-info-dark);
   border-color: rgba(112, 192, 232, 0.45);
 }
diff --git a/apps/web/src/oj/problem/list.vue b/apps/web/src/oj/problem/list.vue
index 560afbf..1875408 100644
--- a/apps/web/src/oj/problem/list.vue
+++ b/apps/web/src/oj/problem/list.vue
@@ -44,7 +44,7 @@ const DIFFICULTIES = [
   { label: "困难", value: "High" },
 ]
 
-const TYPES: ProblemTypeFilter[] = ["reference", "flowchart", "ast"]
+const TYPES: ProblemTypeFilter[] = ["sql", "reference", "flowchart", "ast"]
 
 /** 新生一道还没做对时，顶行引去的知识点 */
 const START_TAG = "输出入门"
diff --git a/apps/web/src/oj/problem/utils/problemType.ts b/apps/web/src/oj/problem/utils/problemType.ts
index 9fc73f5..894f4a2 100644
--- a/apps/web/src/oj/problem/utils/problemType.ts
+++ b/apps/web/src/oj/problem/utils/problemType.ts
@@ -2,6 +2,7 @@ import type { ProblemTypeFilter } from "@oj2/contract"
 
 /** 名字和题目页一致：「语法要求」（题目页原来叫「代码要求」，一起改了） */
 export const PROBLEM_TYPE_LABEL: Record<ProblemTypeFilter, string> = {
+  sql: "SQL",
   flowchart: "画流程图",
   ast: "语法要求",
   reference: "有参考图",
@@ -9,18 +10,21 @@ export const PROBLEM_TYPE_LABEL: Record<ProblemTypeFilter, string> = {
 
 /** 「全部类型」下拉里每项下面那句话 */
 export const PROBLEM_TYPE_HINT: Record<ProblemTypeFilter, string> = {
+  sql: "写 SQL 语句查数据库，不是写 C / Python 程序",
   reference: "题目里附了老师画好的流程图，照着写代码",
   flowchart: "除了写代码，也可以交流程图；评到 A 或 S 级算做对",
   ast: "要求用（或者不能用）某种写法，交了会检查",
 }
 
-/** 一道题挂哪几个标签，从醒目到轻：画流程图 → 语法要求 → 有参考图 */
+/** 一道题挂哪几个标签，从醒目到轻：SQL → 画流程图 → 语法要求 → 有参考图 */
 export function problemTypes(problem: {
+  isSql: boolean
   allowFlowchart: boolean
   hasAstRules: boolean
   showFlowchart: boolean
 }): ProblemTypeFilter[] {
   const kinds: ProblemTypeFilter[] = []
+  if (problem.isSql) kinds.push("sql")
   if (problem.allowFlowchart) kinds.push("flowchart")
   if (problem.hasAstRules) kinds.push("ast")
   if (problem.showFlowchart) kinds.push("reference")
diff --git a/apps/web/src/oj/transforms.ts b/apps/web/src/oj/transforms.ts
index fc94c04..5140432 100644
--- a/apps/web/src/oj/transforms.ts
+++ b/apps/web/src/oj/transforms.ts
@@ -23,6 +23,7 @@ export function toProblemRow(result: ProblemListItem): ProblemRow {
     allowFlowchart: result.allowFlowchart,
     showFlowchart: result.showFlowchart,
     hasAstRules: result.hasAstRules,
+    isSql: result.isSql,
     solvedUsers: result.solvedUsers,
     triedUsers: result.triedUsers,
   }
diff --git a/apps/web/src/utils/types.ts b/apps/web/src/utils/types.ts
index f612404..cbd1b2d 100644
--- a/apps/web/src/utils/types.ts
+++ b/apps/web/src/utils/types.ts
@@ -167,6 +167,7 @@ export interface ProblemRow {
   allowFlowchart: boolean
   showFlowchart: boolean
   hasAstRules: boolean
+  isSql: boolean
   solvedUsers: number
   triedUsers: number
 }
diff --git a/packages/contract/src/problem.ts b/packages/contract/src/problem.ts
index e4fd85e..a3cc665 100644
--- a/packages/contract/src/problem.ts
+++ b/packages/contract/src/problem.ts
@@ -424,6 +424,8 @@ export const problemListItemSchema = z.object({
   allowFlowchart: z.boolean(),
   showFlowchart: z.boolean(),
   hasAstRules: z.boolean(),
+  /** SQL 题（可选语言里有 SQL）：写 SQL 语句查数据库，和写 C / Python 是两回事，列表里单独标出来 */
+  isSql: z.boolean(),
   /** 0 = 做对了。画流程图的题，流程图评到 A / S 也给 0（和题单、课堂条一个口径） */
   myStatus: z.number().int().nullable(),
   /**
@@ -436,8 +438,8 @@ export const problemListItemSchema = z.object({
 
 export const problemListSchema = paginatedSchema(problemListItemSchema)
 
-/** 题目列表「全部类型」下拉：有参考图 / 画流程图 / 语法要求 */
-export const problemTypeFilterSchema = z.enum(["reference", "flowchart", "ast"])
+/** 题目列表「全部类型」下拉：SQL / 有参考图 / 画流程图 / 语法要求 */
+export const problemTypeFilterSchema = z.enum(["sql", "reference", "flowchart", "ast"])
 
 /**
  * 题目列表的排序。值沿用原来的（旧链接照样能用）：空串 = 最新创建、create_time = 最早创建，