WebThe last step is to add data from the fourth table (in our example, teacher ). and join using the key from these tables (in our example, id from the teacher table and teacher_id from … WebI want to join all the 4 tables. I tried like this: select a.Id,b.data_desc,c.other_desc,d.date from tab1 a,tab2 b,tab3 c,tab4d where a.Id=b.Id and b.Id = d.Id and c.Id=a.Id; This is the output …
How to write a SQL to join with multiple tables and select r
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oracle - Joining 4 tables and selecting distinct values …
WebJun 2, 2011 · Without the 4th column above, the optimiser uses a nested loop join as before, using #smalltable as the outer input, and a non-clustered index seek as the inner loop (executing 480 times again). What concerns me is the disparity between the estimated rows (12,958.4) and actual rows (74,668,468). The relative cost of these seeks is 45%. WebOracle combines each row returned by Step 2 with the matching row returned by Step 4 and returns the result. Sort-Merge Join Oracle can only perform a sort-merge join for an equijoin. Oracle sorts each row source to be joined if they have … WebAug 17, 2016 · Once you've done this, check the execution plan for your query. Use this to see what Oracle is doing. Then take appropriate action. If you need help with this, create an execution (repeat execution, not explain) plan. Post it here along with the query, details of the table and its indexes. Then we'll see what we can do. how far is slidell la from houston tx