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Questions - left-join

Left Join postgres SQL duplicate ON column

I am doing a LEFT JOIN on a postgres table. As a result, in my final table appears a duplicate column, which is the column ON I have done the join. Why? select * from ltc_ts lt left join ltc_stock_me...
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arrabattapp man

sql

postgresql

duplicates

left-join

Votes: 0

Answers: 1

Latest Answer

The recommended solution is to not use select * but only select those columns that you really need. If you want to stick with select * you can join with the using() clause instead. This will then retu...
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a_horse_with_no_name

Getting different results from Subquery and JOIN which seem to be the same

I'm doing a challenge problem on DataCamp. It uses two tables, "economies" which contains economic information by country code, and "countries" which contains general country infor...
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Christopher V Elwood

sql

join

subquery

left-join

Votes: 0

Answers: 1

Latest Answer

In the first query you destroy the effect of the left join by putting conditions on the fields of the joined table. For example, c.gov_form <> 'Constitutional Monarchy' will be false when there ...
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trincot

Single columns from several rows into several columns in one record, but allow NULL in the rows

I'm trying to combine single rows from multiple records into several columns in one record. Say we have a database of people and they've all chosen 2 numbers. But, some people have only chosen 1 numbe...
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lemuria

sql

sqlite

group-by

left-join

conditional-aggregation

Votes: 0

Answers: 1

Latest Answer

You can use conditional aggregation: SELECT p.*, MAX(CASE WHEN c.type = 'first' THEN c.chosen_num END) AS first_num, MAX(CASE WHEN c.type = 'second' THEN c.chosen_num END) AS second_num ...
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forpas

Can&#39;t do Multiple Left Joins SQL Select (ODBC)

When I run the following SQL select statement with two left joins: SELECT t01.owner FROM rnglib001.gldtpf t01 LEFT JOIN rngmst001.wlddpf t02 ON t01.prprty = t02.prprty LEFT JOIN rngmst001.glmtpf t03 ...
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Logan Price

sql

excel

vba

runtime-error

left-join

Votes: 0

Answers: 1

Latest Answer

The answer is very simple. Per Tim Williams, all I had to do was just remove the Array() from the .CommandText line and that fixed it.
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Logan Price

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