{"id":19732,"date":"2022-11-07T14:31:41","date_gmt":"2022-11-07T09:01:41","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-i-need-to-join-2-databases-with-2-tables-each\/"},"modified":"2022-11-07T14:31:41","modified_gmt":"2022-11-07T09:01:41","slug":"solved-i-need-to-join-2-databases-with-2-tables-each","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-i-need-to-join-2-databases-with-2-tables-each\/","title":{"rendered":"[Solved] I need to join 2 databases, with 2 tables each"},"content":{"rendered":"

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\n<\/p>\n

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With a UNION ALL you can get 1 combined resultset from 2 selects.
\nThen you can group that and SUM the amounts per date.<\/p>\n

So you’re probably looking for something like this:\n<\/p>\n

select \n q.ID,\n q.Name,\n nullif(sum(case when q.Date=\"2018-05-01\" then q.Amount end), 0) as \"5\/1\/2018\",\n nullif(sum(case when q.Date=\"2018-05-02\" then q.Amount end), 0) as \"5\/2\/2018\"\nfrom\n(\n  select u1.ID, u1.Name, a1.Date, a1.Amount\n  from DB1.Table1 AS u1\n  join DB1.Table2 AS a1 on (a1.ID = u1.ID and a1.Amount is not null)\n  where a1.Date IN ('2018-05-01', '2018-05-02')\n\n  union all -- combines the results of the 2 selects into one resultset\n\n  select u2.ID, u2.Name, a2.Date, a2.Amount\n  from DB2.Table1 AS u2\n  join DB2.Table2 AS a2 on (a2.ID = u2.ID and a2.Amount is not null)\n  where a2.Date IN ('2018-05-01', '2018-05-02')\n) AS q\ngroup by q.ID, q.Name\norder by q.ID;\n<\/code><\/pre>\n
An alternative is to JOIN them all up.\n<\/p>\n
select \ncoalesce(a1.ID, a2.ID) as ID,\nmax(coalesce(u1.Name, u2.Name)) as Name, \nmax(case \n    when coalesce(a1.Date, a2.Date) = '2018-05-01'\n     and coalesce(a1.Amount, a2.Amount) is not null\n    then coalesce(a1.Amount, 0) + coalesce(a2.Amount, 0) \n    end) as \"5\/1\/2018\",\nmax(case \n    when coalesce(a1.Date, a2.Date) = '2018-05-02'\n     and coalesce(a1.Amount, a2.Amount) is not null\n    then coalesce(a1.Amount, 0) + coalesce(a2.Amount, 0) \n    end) as \"5\/2\/2018\"\nfrom DB1.Table2 AS a1 \nfull join DB2.Table2 AS a2 on (a2.ID = a1.ID and a2.Date = a1.Date)\nleft join DB1.Table1 AS u1 on (u1.ID = a1.ID)\nleft join DB2.Table1 AS u2 on (u2.ID = a2.ID)\nwhere coalesce(a1.Date, a2.Date) IN ('2018-05-01', '2018-05-02')\ngroup by coalesce(a1.ID, a2.ID)\norder by coalesce(a1.ID, a2.ID);\n<\/code><\/pre>\n
But then note that this way, that there’s an assumption that the two Table2 have a uniqueness on (ID, Date)<\/p>\n
\n
\n
 T-Sql test data:
\n declare @DB1_Table1 table (id int, Name varchar(30));
\n declare @DB2_Table1 table (id int, Name varchar(30));
\n declare @DB1_Table2 table (id int, [Date] date, Amount decimal(8,2));
\n declare @DB2_Table2 table (id int, [Date] date, Amount decimal(8,2));
\n insert into @DB1_Table1 (id, Name) values (1,’Susan’),(2,’Juan’),(3,’Tracy’),(4,’Jenny’),(5,’Bill’);
\n insert into @DB2_Table1 (id, Name) values (1,’Susan’),(2,’Juan’),(3,’Tracy’),(4,’Jenny’),(5,’Bill’);
\n insert into @DB1_Table2 (id, [Date], Amount) values
\n (1,’2018-05-01′,20),(2,’2018-05-01′,null),(3,’2018-05-01′,30),(4,’2018-05-01′,50),(5,’2018-05-01′,null),
\n (1,’2018-05-02′,15),(2,’2018-05-02′,40),(3,’2018-05-02′,25),(4,’2018-05-02′,8),(5,’2018-05-02′,null);
\n insert into @DB2_Table2 (id, [Date], Amount) values
\n (1,’2018-05-01′,null),(2,’2018-05-01′,15),(3,’2018-05-01′,20),(4,’2018-05-01′,10),(5,’2018-05-01′,null),
\n (1,’2018-05-02′,15),(2,’2018-05-02′,30),(3,’2018-05-02′,35),(4,’2018-05-02′,null),(5,’2018-05-02′,30);<\/p>\n<\/blockquote><\/div>\n
<\/div>\n<\/div>\n
            21<\/span> <\/p><\/div>\n<\/div>\n
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solved I need to join 2 databases, with 2 tables each <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] With a UNION ALL you can get 1 combined resultset from 2 selects. Then you can group that and SUM the amounts per date. So you’re probably looking for something like this: select q.ID, q.Name, nullif(sum(case when q.Date=”2018-05-01″ then q.Amount end), 0) as “5\/1\/2018″, nullif(sum(case when q.Date=”2018-05-02” then q.Amount end), 0) as “5\/2\/2018” from … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[473,341,353],"class_list":["post-19732","post","type-post","status-publish","format-standard","hentry","category-solved","tag-ms-access","tag-sql","tag-vb-net"],"yoast_head":"\n[Solved] I need to join 2 databases, with 2 tables each - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-i-need-to-join-2-databases-with-2-tables-each\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] I need to join 2 databases, with 2 tables each - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] With a UNION ALL you can get 1 combined resultset from 2 selects. Then you can group that and SUM the amounts per date. So you’re probably looking for something like this: select q.ID, q.Name, nullif(sum(case when q.Date="2018-05-01" then q.Amount end), 0) as "5\/1\/2018", nullif(sum(case when q.Date="2018-05-02" then q.Amount end), 0) as "5\/2\/2018" from ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-i-need-to-join-2-databases-with-2-tables-each\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-11-07T09:01:41+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-i-need-to-join-2-databases-with-2-tables-each\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-i-need-to-join-2-databases-with-2-tables-each\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] I need to join 2 databases, with 2 tables each\",\"datePublished\":\"2022-11-07T09:01:41+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-i-need-to-join-2-databases-with-2-tables-each\/\"},\"wordCount\":205,\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"keywords\":[\"ms-access\",\"sql\",\"vb.net\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-i-need-to-join-2-databases-with-2-tables-each\/\",\"url\":\"https:\/\/jassweb.com\/solved\/solved-i-need-to-join-2-databases-with-2-tables-each\/\",\"name\":\"[Solved] I need to join 2 databases, with 2 tables each - 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Then you can group that and SUM the amounts per date. So you’re probably looking for something like this: select q.ID, q.Name, nullif(sum(case when q.Date=\"2018-05-01\" then q.Amount end), 0) as \"5\/1\/2018\", nullif(sum(case when q.Date=\"2018-05-02\" then q.Amount end), 0) as \"5\/2\/2018\" from ... 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