{"id":99503,"date":"2022-06-28T11:26:10","date_gmt":"2022-06-28T02:26:10","guid":{"rendered":"https:\/\/softantenna.com\/blog\/?p=99503"},"modified":"2022-06-28T11:26:10","modified_gmt":"2022-06-28T02:26:10","slug":"prql","status":"publish","type":"post","link":"https:\/\/softantenna.com\/blog\/prql\/","title":{"rendered":"PRQL - SQL\u3092\u7f6e\u304d\u63db\u3048\u3092\u76ee\u6307\u3059\u30e2\u30c0\u30f3\u306a\u30c7\u30fc\u30bf\u5909\u63db\u8a00\u8a9e"},"content":{"rendered":"

\"S<\/p>\n

\u73fe\u5728\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9(RDBMS)\u3092\u64cd\u4f5c\u3059\u308b\u8a00\u8a9e\u3068\u3057\u3066\u306f\u3001\u300cSQL\u300d\u304c\u6700\u3082\u666e\u53ca\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

SQL\u306f\u591a\u6a5f\u80fd\u3067\u9577\u3044\u6b74\u53f2\u3092\u6301\u3061\u307e\u3059\u304c\u3001\u82f1\u8a9e\u98a8\u306e\u69cb\u6587\u3092\u63a1\u7528\u3057\u3001\u8907\u96d1\u306a\u554f\u3044\u5408\u308f\u305b\u3092\u884c\u308f\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u5834\u5408\u3001\u30d9\u30c6\u30e9\u30f3\u306e\u958b\u767a\u8005\u3067\u3082\u982d\u3092\u60a9\u307e\u305b\u308b\u3053\u3068\u306b\u306a\u308a\u304c\u3061\u3067\u3059\u3002<\/p>\n

\u300cPRQL<\/a>\u300d\u306f\u3001\u3053\u306e\u6b20\u70b9\u3092\u89e3\u6c7a\u3059\u3079\u304f\u958b\u767a\u304c\u9032\u3081\u3089\u308c\u3066\u3044\u308b\u30c7\u30fc\u30bf\u5909\u63db\u8a00\u8a9e\u3067\u3059\u3002\u53ef\u8aad\u6027\u304c\u9ad8\u304f\u3001\u660e\u793a\u7684\u304b\u3064\u5ba3\u8a00\u7684\u3067\u3001SQL\u3068\u306f\u7570\u306a\u308a\u3001\u8ad6\u7406\u7684\u306a\u5909\u63db\u306e\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3\u3092\u5f62\u6210\u3057\u3001\u5909\u6570\u3084\u95a2\u6570\u306a\u3069\u306e\u62bd\u8c61\u5316\u3055\u308c\u305f\u6a5f\u80fd\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002SQL\u306b\u30c8\u30e9\u30f3\u30b9\u30d1\u30a4\u30eb\u3059\u308b\u305f\u3081\u3001SQL\u3092\u4f7f\u7528\u3059\u308b\u5168\u3066\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u4f8b\u3048\u3070\u5f93\u696d\u54e1\u30c6\u30fc\u30d6\u30eb\u304b\u3089\u3001\u7c73\u56fd\u306e\u5f93\u696d\u54e1\u306e\u6570\u3001\u6700\u5927\u3001\u6700\u5c0f\u306e\u30b5\u30e9\u30ea\u30fc\u3092\u63a2\u3059\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u69cb\u6587\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n

\nfrom employees\nfilter country == \"USA\"                       # Each line transforms the previous result.\naggregate [                                   # `aggregate` reduces column to a value.\n  max salary,\n  min salary,\n  count,                                      # Closing commas are allowed :)\n]\n<\/pre>\n
\u3053\u308c\u306fSQL\u3067\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\nSELECT\n  MAX(salary),\n  MIN(salary),\n  COUNT(*)\nFROM\n  employees\nWHERE\n  country = 'USA'\n<\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u305d\u308c\u307b\u3069\u3067\u3082\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u3088\u308a\u8907\u96d1\u306a\u4f8b\u3067\u306fPRQL\u306e\u65b9\u304c\u8aad\u307f\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n
PRQL:<\/p>\n
\nfrom employees\nfilter start_date > @2021-01-01               # Clear date syntax.\nderive [                                      # `derive` adds columns \/ variables.\n  gross_salary = salary + (tax ?? 0),         # Terse coalesce\n  gross_cost = gross_salary + benefits_cost,  # Variables can use other variables.\n]\nfilter gross_cost > 0\ngroup [title, country] (                      # `group` runs a pipeline over each group.\n  aggregate [                                 # `aggregate` reduces each group to a row.\n    average gross_salary,\n    sum_gross_cost = sum gross_cost,          # `=` sets a column name.\n  ]\n)\nfilter sum_gross_cost > 100000                # Identical syntax for SQL's `WHERE` & `HAVING`.\nderive id = f\"{title}_{country}\"              # F-strings like python.\nsort [sum_gross_cost, -country]               # `-country` means descending order.\ntake 1..20                                    # Range expressions (also valid here as `take 20`).\n\n<\/pre>\n
SQL:<\/p>\n
\noutput.sql\nSELECT\n  title,\n  country,\n  AVG(salary + COALESCE(tax, 0)),\n  SUM(salary + COALESCE(tax, 0) + benefits_cost) AS sum_gross_cost,\n  CONCAT(title, '_', country) AS id\nFROM\n  employees\nWHERE\n  start_date > DATE '2021-01-01'\n  AND salary + COALESCE(tax, 0) + benefits_cost > 0\nGROUP BY\n  title,\n  country\nHAVING\n  SUM(salary + COALESCE(tax, 0) + benefits_cost) > 100000\nORDER BY\n  sum_gross_cost,\n  country DESC\nLIMIT\n  20\n<\/pre>\n
PRQL\u306e\u4f7f\u7528\u65b9\u6cd5<\/h2>\n
PRQL\u306e\u4f7f\u7528\u65b9\u6cd5\u3092\u5b66\u3073\u305f\u3044\u5834\u5408\u300cPRQL Playground<\/a>\u300d\u3092\u4f7f\u7528\u3059\u308b\u306e\u304c\u7c21\u5358\u3067\u3059\u3002<\/p>\n
\"S<\/p>\n
\u25b2\u753b\u9762\u306e\u5de6\u5074\u306bPRQL\u3092\u5165\u529b\u3059\u308b\u3068\u3001SQL\u3078\u306e\u5909\u63db\u7d50\u679c\u304c\u53f3\u5074\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002PRQL\u306e\u4f8b\u6587\u306f\u3053\u3061\u3089<\/a>\u3067\u78ba\u8a8d\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\u8a00\u8a9e\u306e\u4ed5\u69d8\u306f\u300cPRQL Language Book<\/a>\u300d\u3067\u78ba\u8a8d\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\u30d7\u30ed\u30b0\u30e9\u30e0\u304b\u3089\u4f7f\u3044\u305f\u3044\u5834\u5408\u3001Python\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u306e\u300cprql-python<\/a>\u300d\u3084\u3001JavaScript\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u306e\u300cprql-js<\/a>\u300d\u3001Rust\u3067\u66f8\u304b\u308c\u305f\u30b3\u30f3\u30d1\u30a4\u30e9\u300cprql-compiler<\/a>\u300d\u306a\u3069\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u307e\u3068\u3081<\/h2>\n
\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u64cd\u4f5c\u8a00\u8a9e\u3068\u3057\u3066\u3001\u73fe\u72b6\u3067\u306fSQL\u304c\u5727\u5012\u7684\u3067\u3059\u304c\u3001PRQL\u304c\u666e\u53ca\u3059\u308c\u3070\u3088\u308a\u4f7f\u3044\u3084\u3059\u3044\u554f\u3044\u5408\u308f\u305b\u8a00\u8a9e\u304c\u3055\u307e\u3056\u307e\u306a\u5834\u6240\u3067\u6d3b\u7528\u3067\u304d\u308b\u3053\u3068\u306b\u306a\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002Hacker News<\/a>\u3067\u3082PRQL\u306e\u53ef\u80fd\u6027\u306b\u95a2\u3059\u308b\u8b70\u8ad6\u304c\u884c\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u30cf\u30c3\u30ab\u30fc\u9054\u304c\u3069\u306e\u3088\u3046\u306b\u3053\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u3068\u3089\u3048\u3066\u3044\u308b\u306e\u304b\u3001\u77e5\u308a\u305f\u3044\u65b9\u306f\u78ba\u8a8d\u3057\u3066\u307f\u3066\u306f\u3044\u304b\u304c\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u73fe\u5728\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9(RDBMS)\u3092\u64cd\u4f5c\u3059\u308b\u8a00\u8a9e\u3068\u3057\u3066\u306f\u3001\u300cSQL\u300d\u304c\u6700\u3082\u666e\u53ca\u3057\u3066\u3044\u307e\u3059\u3002 SQL\u306f\u591a\u6a5f\u80fd\u3067\u9577\u3044\u6b74\u53f2\u3092\u6301\u3061\u307e\u3059\u304c\u3001\u82f1\u8a9e\u98a8\u306e\u69cb\u6587\u3092\u63a1\u7528\u3057\u3001\u8907\u96d1\u306a\u554f\u3044\u5408\u308f\u305b\u3092\u884c\u308f\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u5834\u5408\u3001\u30d9\u30c6\u30e9\u30f3\u306e\u958b\u767a\u8005\u3067\u3082\u982d\u3092\u60a9\u307e […]<\/p>\n","protected":false},"author":2,"featured_media":99504,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[3459],"tags":[2893],"class_list":["post-99503","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-review","tag-sql"],"_links":{"self":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts\/99503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/comments?post=99503"}],"version-history":[{"count":0,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/posts\/99503\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/media\/99504"}],"wp:attachment":[{"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/media?parent=99503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/categories?post=99503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/softantenna.com\/blog\/wp-json\/wp\/v2\/tags?post=99503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}