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Showing posts with the label Join
Not Quite Understanding The Query After Just Shifting Column Names

Not Quite Understanding The Query After Just Shifting Column Names

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This is my table tblEmployee ,when I'm trying to use a self join query it's result is varyi… Read more Not Quite Understanding The Query After Just Shifting Column Names
Query Based On Common Criteria From Two Tables And Sort Based On Number Of Occurrences

Query Based On Common Criteria From Two Tables And Sort Based On Number Of Occurrences

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I have the following tables that I need to run query against each. userA id name … Read more Query Based On Common Criteria From Two Tables And Sort Based On Number Of Occurrences
Sql Order Of Operations

Sql Order Of Operations

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If I run the following SQL query SELECT * FROM A LEFT JOIN B ON A.foo=B.foo WHERE A.date = 'Ye… Read more Sql Order Of Operations
Sql: Speed Improvement - Left Join On Cond1 Or Cond2

Sql: Speed Improvement - Left Join On Cond1 Or Cond2

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SELECT DISTINCT a.*, b.* FROM current_tbl a LEFT JOIN import_tbl b … Read more Sql: Speed Improvement - Left Join On Cond1 Or Cond2
Sql Query Performance Question (multiple Sub-queries)

Sql Query Performance Question (multiple Sub-queries)

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I have this query: SELECT p.id, r.status, r.title FROM page AS p INNER JOIN page_revision as r … Read more Sql Query Performance Question (multiple Sub-queries)
Understanding Cartesian Product In Sql

Understanding Cartesian Product In Sql

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I am not able to understand how Cartesian product works. Consider the simple schema: mysql> sele… Read more Understanding Cartesian Product In Sql