tool.sql_queries.aff09c2fbf49d9f8 SKILL.md skillA
tool.sql_queries.aff09c2fbf49d9f8 from ai45lab/openart is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ai45lab/openart/tool.sql_queries.aff09c2fbf49d9f8@git:20260717.d255bbcPins git:20260717.d255bbc in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ai45lab/openart
- Path
openart-tools/tool.sql_queries.aff09c2fbf49d9f8/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260717.d255bbc, committed Jul 17, 2026
- Size
- 11,245 bytes
- Repository stars
- 271
- License
- AGPL-3.0
"\u5728\u6240\u6709\u4E3B\u6D41\u6570\u636E\u4ED3\u5E93\u65B9\u8A00\uFF08\.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
Use this skill when the OpenART registry selects `tool.sql_queries.aff09c2fbf49d9f8` for the current task.
# SQL 查询技能
在所有主流数据仓库方言中，编写正确、高效、可读的 SQL。
## 方言专项参考
### PostgreSQL（含 Aurora、RDS、Supabase、Neon）
**日期/时间：**
```sql
-- 当前日期/时间
CURRENT_DATE, CURRENT_TIMESTAMP, NOW()
-- 日期运算
date_column + INTERVAL '7 days'
date_column - INTERVAL '1 month'
-- 截断到周期
DATE_TRUNC('month', created_at)
-- 提取部分
EXTRACT(YEAR FROM created_at)
EXTRACT(DOW FROM created_at) -- 0=周日
-- 格式化
TO_CHAR(created_at, 'YYYY-MM-DD')
```
**字符串函数：**
```sql
-- 拼接
first_name || ' ' || last_name
CONCAT(first_name, ' ', last_name)
-- 模式匹配
column ILIKE '%pattern%' -- 不区分大小写
column ~ '^regex_pattern$' -- 正则
-- 字符串操作
LEFT(str, n), RIGHT(str, n)
SPLIT_PART(str, delimiter, position)
REGEXP_REPLACE(str, pattern, replacement)
```
**数组与 JSON：**
```sql
-- JSON 访问
data->>'key' -- 文本
data->'nested'->'key' -- json
data#>>'{path,to,key}' -- 嵌套文本
-- 数组操作
ARRAY_AGG(column)
ANY(array_column)
array_column @> ARRAY['value']
```
**性能技巧：**
- 使用 `EXPLAIN ANALYZE` 分析查询
- 为频繁过滤/关联的字段创建索引
- 关联子查询优先使用 `EXISTS` 而非 `IN`
- 常用过滤条件使用部分索引
- 并发访问使用连接池
---
### Snowflake
**日期/时间：**
```sql
-- 当前日期/时间
…Read the whole file at its exact version.
How to install
mdr add ai45lab/openart/tool.sql_queries.aff09c2fbf49d9f8@sha256:288455f46107bfeeThe line at the top of this page pins the label git:20260717.d255bbc, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_f4q7ewk42owtlujt)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jul 17, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (11245 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
ai45lab/openart · 271 stars · license AGPL-3.0 · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_f4q7ewk42owtlujt GET https://markdownregistry.com/api/v1/resolve?ref=ai45lab/openart/tool.sql_queries.aff09c2fbf49d9f8 GET https://markdownregistry.com/api/v1/blob/288455f46107bfee877e428c49543db4e133c92b66e7512c9d197a300b2bb995
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.