{"id":3125,"date":"2024-10-27T21:59:05","date_gmt":"2024-10-28T02:59:05","guid":{"rendered":"https:\/\/www.dpriver.com\/blog\/?p=3125"},"modified":"2024-10-27T22:12:33","modified_gmt":"2024-10-28T03:12:33","slug":"discover-data-lineage-from-sub-query-and-cte","status":"publish","type":"post","link":"https:\/\/www.dpriver.com\/blog\/2024\/10\/discover-data-lineage-from-sub-query-and-cte\/","title":{"rendered":"Discover data lineage from sub-query and CTE"},"content":{"rendered":"\n

SQL’s flexibility allows multiple approaches to achieve the same result in a statement. Below, three variations of SQL statements are shown to update the PARENT_TABLE<\/code> column in the CCF<\/code> table based on values from the PARENT_TABLE<\/code> column in the CCF_BAK<\/code> table.<\/p>\n\n\n\n

    \n
  1. Using UPDATE<\/code> with a single sub-query.<\/li>\n\n\n\n
  2. Using UPDATE<\/code> with two sub-queries.<\/li>\n\n\n\n
  3. Using a CTE<\/code> (Common Table Expression).<\/li>\n<\/ol>\n\n\n\n

    SQLFlow can accurately map the data lineage for all three approaches.<\/p>\n\n\n\n

    \"\"<\/a><\/figure>\n\n\n\n
    -- sql server\nUPDATE s\nSET s.PARENT_TABLE = u.PARENT_TABLE\nFROM dwh_user.jv.CCF s\nJOIN (\n    SELECT TOP 1 *\n    FROM dwh_user.jv.CCF_BAK u\n    WHERE u.PRODUCT_NAME = 'Business loan'\n) u ON 1 = 1\nWHERE s.PRODUCT_NAME = 'Business loan'<\/code><\/pre>\n\n\n\n
    Data lineage of the first SQL statement in xml format generated by SQLFlow<\/a>:<\/p>\n\n\n\n
    <relationship id=\"10\" type=\"fdd\" effectType=\"update\" processId=\"5\" processType=\"sstupdate\">\n    <target id=\"19\" column=\"PARENT_TABLE\" parent_id=\"4\" parent_name=\"dwh_user.jv.CCF\" parent_alias=\"s\"\/>\n    <source id=\"13\" column=\"PARENT_TABLE\" parent_id=\"11\" parent_name=\"dwh_user.jv.CCF_BAK\" parent_alias=\"u\"\/>\n<\/relationship><\/code><\/pre>\n\n\n\n
    -- sql server\nUPDATE s\nSET s.PARENT_TABLE = u.PARENT_TABLE\nFROM (\n    SELECT *\n    FROM dwh_user.jv.CCF s\n    WHERE s.PRODUCT_NAME = 'Business loan'\n) s\nJOIN (\n    SELECT TOP 1 *\n    FROM dwh_user.jv.CCF_BAK u\n    WHERE u.PRODUCT_NAME = 'Business loan'\n) u ON 1 = 1<\/code><\/pre>\n\n\n\n
    Data lineage of the second SQL statement in xml format generated by SQLFlow<\/a>:<\/p>\n\n\n\n
    <relationship id=\"12\" type=\"fdd\" effectType=\"update\" processId=\"5\" processType=\"sstupdate\">\n    <target id=\"24\" column=\"PARENT_TABLE\" parent_id=\"4\" parent_name=\"dwh_user.jv.CCF\" parent_alias=\"s\"\/>\n    <source id=\"18\" column=\"PARENT_TABLE\" parent_id=\"16\" parent_name=\"dwh_user.jv.CCF_BAK\" parent_alias=\"u\"\/>\n<\/relationship><\/code><\/pre>\n\n\n\n
    -- sql server\nWITH\n    s AS (\n        SELECT PARENT_TABLE\n        FROM dwh_user.jv.CCF s\n        WHERE s.PRODUCT_NAME = 'Business loan'\n    ),\n    u AS (\n        SELECT TOP 1 PARENT_TABLE\n        FROM dwh_user.jv.CCF_BAK u\n        WHERE u.PRODUCT_NAME = 'Business loan'\n    )\nUPDATE s\nSET s.PARENT_TABLE = u.PARENT_TABLE\nFROM s\nJOIN u ON 1 = 1<\/code><\/pre>\n\n\n\n
    Data lineage of the third SQL statement in xml format generated by SQLFlow<\/a>:<\/p>\n\n\n\n
    <relationship id=\"19\" type=\"fdd\" effectType=\"update\" processId=\"5\" processType=\"sstupdate\">\n    <target id=\"10\" column=\"PARENT_TABLE\" parent_id=\"4\" parent_name=\"dwh_user.jv.CCF\" parent_alias=\"s\"\/>\n    <source id=\"24\" column=\"PARENT_TABLE\" parent_id=\"23\" parent_name=\"dwh_user.jv.CCF_BAK\" parent_alias=\"u\"\/>\n<\/relationship><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
    SQL’s flexibility allows multiple approaches to achieve the same result in a statement. Below, three variations of SQL statements are shown to update the PARENT_TABLE column in the CCF table based on values from the PARENT_TABLE column in the CCF_BAK table. SQLFlow can accurately map the data lineage for all three approaches. Data lineage of the first SQL statement in xml format generated by SQLFlow: Data lineage of the second SQL statement in xml format generated by SQLFlow: Data lineage of the third SQL statement in xml format generated by SQLFlow:<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":5}},"yoast_head":"\nDiscover data lineage from sub-query and CTE<\/title>\n<meta name=\"description\" content=\"Discover data lineage from sub-query and CTE\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dpriver.com\/blog\/2024\/10\/discover-data-lineage-from-sub-query-and-cte\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta 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