PawSQL新功能精選，你都知道嗎？
作者：PawSQL
PawSQL Cloud，在線自動化SQL優(yōu)化工具，支持SQL審查，智能查詢重寫、基于代價的索引推薦，適用于數(shù)據(jù)庫管理員及數(shù)據(jù)應用開發(fā)人員。
- 新增了IN子查詢重寫優(yōu)化。
- 詳情請參考https://app.pawsql.com/docs/rule/RuleInSubqueryRewrite
- 全面支持PostgreSQL和MySQL分析函數(shù)。
聚集函數(shù)
select string_agg(c_name,',') as name from customer group by c_phone;
select c_custkey,group_concat(c_name order by c_name desc ) from customer group by c_custkey;聚集函數(shù) + 過濾
select string_agg(c_name,',') filter (where c_name like 'ABC%') as name from customer group by c_phone;
select count(1) filter (where c_name like 'ABC%') from customer group by c_phone;窗口函數(shù)
select *, row_number() over (partition by o_custkey order by o_orderkey desc) as rank from orders where o_orderdate = '2022-01-01';
select string_agg(c_name,',') over (partition by c_phone) as name from customer;
-- rows/range
select string_agg(c_name,',') filter (where c_name like 'ABC%') over(partition by c_phone order by c_name ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) as name from customer;
-- exclude
select string_agg(c_name,',') over(partition by c_phone order by c_name ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING EXCLUDE TIES) as name
from customer;窗口函數(shù) + 過濾
select string_agg(c_name,',') filter (where c_name like 'ABC%') over(partition by c_phone) as name from customer;
select *, row_number() filter (where c_name like 'ABC%') over (partition by o_custkey order by o_orderkey desc) as rank from orders where o_orderdate = '2022-01-01';WITHIN函數(shù)
select string_agg(c_name,',') within group(order by c_custkey) over(partition by c_phone) name from customer;
SELECT percentile_cont(0.5) WITHIN GROUP (ORDER BY o.o_totalprice) FROM orders o group by o_custkey;支持表函數(shù)
SELECT * FROM generate_series(1, 10 ) AS t (n); SELECT * FROM customer c, (VALUES( 1 ,2), (3, 4)) AS t(a, b) WHERE t.a = c.c_current_addr_sk AND c.c_customer_sk > t.b;
異常處理
PawSQL識別兩種語法解析錯誤，并在結(jié)果中提示用戶，以便用戶修正自己的SQL。
- 語法解析錯誤
- 數(shù)據(jù)庫對象不存在
What-If性能驗證analyze支持
- 在進行What-If性能驗證時，提供analzye選項，獲取SQL的真實解析及執(zhí)行代價，避免了MySQL對中間結(jié)果表explain的缺陷，代價估算更加精確。
用戶反饋
- 在首頁及SQL優(yōu)化詳情頁面新增了用戶反饋渠道。
- 方便用戶對PawSQL整體功能、使用感受進行反饋。
- 方便用戶對特定SQL優(yōu)化結(jié)果進行反饋。
ChatGpt集成
- 在SQL優(yōu)化詳情頁面的反饋渠道集成了ChatGpt功能，用戶可以通過此功能獲取ChatGpt對相關(guān)SQL的優(yōu)化建議。
缺陷修復
- 已知缺陷的修復
關(guān)于PawSQL
PawSQL專注數(shù)據(jù)庫性能優(yōu)化的自動化和智能化，支持MySQL，PostgreSQL，Opengauss等，提供的SQL優(yōu)化產(chǎn)品包括。
- PawSQL Cloud，在線自動化SQL優(yōu)化工具，支持SQL審查，智能查詢重寫、基于代價的索引推薦，適用于數(shù)據(jù)庫管理員及數(shù)據(jù)應用開發(fā)人員。
- PawSQL Advisor，IntelliJ 插件, 適用于數(shù)據(jù)應用開發(fā)人員，可以IDEA/DataGrip應用市場通過名稱搜索“PawSQL Advisor”安裝。
- PawSQL Engine, 是PawSQL系列產(chǎn)品的后端優(yōu)化引擎，可以獨立安裝部署，并通過http/json的接口提供SQL優(yōu)化服務。PawSQL Engine以docker鏡像的方式提供部署安裝。
責任編輯：姜華
來源：
PawSQL
