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Errors when connecting oracle DB with Power BI I am trying to use Power BI to connect with Oracle 12c Data source, I have looked for multiple solutions and followed the instruction on Microsoft documentation https://docs.microsoft.com/en-us/power-bi/desktop-connect-oracle-database#installing-the-oracle-client But I think there is something missing in work . where I am installing fresh new Oracle and powerbi on the same laptop where server should be in this format "ServerName/SID" as described on documentation, so mine will be: localhost/testdb then adding Database user and password and I get this error I have just installed Oracle 12c 64 bit on my laptop to test the connection also I am using Power Bi 64 bit on also I am on windows 10 64 bit I have also installed "64-bit Oracle Data Access Components (ODAC)" from Oracle website: http://www.oracle.com/technetwork/database/windows/downloads/index-090165.html where I have added my database to DSN using both "OraD...

Is the character “A” a reserved keyword in Oracle Database? [on hold] scenario: In Oracle Database, This SQL it's much slower: SELECT * FROM TBL_MAIN A, TBL_CHILD_1 B, TBL_CHILD_2 C, TBL_CHILD_3 D, TBL_CHILD_4 E WHERE A.ID_MAIN = B.ID_MAIN AND A.ID_MAIN = C.ID_MAIN AND A.ID_MAIN = D.ID_MAIN AND A.ID_MAIN = E.ID_MAIN; than that: SELECT * FROM TBL_MAIN X, TBL_CHILD_1 B, TBL_CHILD_2 C, TBL_CHILD_3 D, TBL_CHILD_4 E WHERE X.ID_MAIN = B.ID_MAIN AND X.ID_MAIN = C.ID_MAIN AND X.ID_MAIN = D.ID_MAIN AND X.ID_MAIN = E.ID_MAIN; In other words, When I have 3 or more tables joined if I use "A" as an aliasing for "TBL_MAIN" table, it results in a slower query. It becomes worst when I added more tables in an inner join with table "TBL_MAIN" AS "A". What is happening? This question appears to be off-topic. The users who voted to close gave this specific reason: I don't believe you. What does the explain plan show for these two?...