join ... using ... and - is this expected behaviour?
От | Rob Johnston |
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Тема | join ... using ... and - is this expected behaviour? |
Дата | |
Msg-id | 4844E979.7020808@jenisys.com.au обсуждение исходный текст |
Ответы |
Re: join ... using ... and - is this expected behaviour?
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Список | pgsql-general |
Just wondering if this is expected behaviour. When executing a query in the form of: select column from table join table using (column) and column = clause pgsql (8.2) returns the following: syntax error at or near "and" Obviously, you can get around this by using "where" instead of "and", but shouldn't the format as used above be valid? The following is... select column from table join table on (column = column) and column = clause The documentation indicates that the two formats of the query are equivalent (http://www.postgresql.org/docs/8.2/interactive/queries-table-expressions.html#QUERIES-JOIN) The following test case illustrates the issue: CREATE TABLE table1 ( columnone integer, columntwo integer ); CREATE TABLE table2 ( columntwo integer, columnthree integer ); insert into table1 values (1, 1), (2, 1); insert into table2 values (1, 3); This query results in a syntax error: select t1.columnone, t1.columntwo, t2.columnthree from table1 t1 join table2 t2 using (columntwo) and columnone = 1 This query executes as expected: select t1.columnone, t1.columntwo, t2.columnthree from table1 t1 join table2 t2 on (t1.columntwo = t2.columntwo) and columnone = 1 Rob Johnston
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