Difference between revisions of "SQL"
Jump to navigation
Jump to search
m |
m |
||
Line 15: | Line 15: | ||
Else z | Else z | ||
End) As CaseResult, | End) As CaseResult, | ||
− | + | SubQuery.fieldname as VALUE_SUBQUERY | |
from | from | ||
− | (Select distinct | + | (Select distinct fieldname, |
from table1 tabalias | from table1 tabalias | ||
Inner Join table2 on table2field = tabalias.field1 | Inner Join table2 on table2field = tabalias.field1 | ||
Line 24: | Line 24: | ||
Where (field1 > 1value And (field2 = 1 And field3 = 'value')) | Where (field1 > 1value And (field2 = 1 And field3 = 'value')) | ||
or (field1 > avalue ) | or (field1 > avalue ) | ||
− | ) as | + | ) as SubQuery |
Inner Join jointable1 On jointable1.field2 = subquery.field1 | Inner Join jointable1 On jointable1.field2 = subquery.field1 | ||
Where subquery.field1 <> jointable1.field1 | Where subquery.field1 <> jointable1.field1 | ||
</syntaxhighlight> | </syntaxhighlight> |
Revision as of 14:32, 23 May 2018
- LPAD(<value>,<no>,<char>)
- Left fill <value> with <char> until <no> length
- concat(<value1>,<value2>)
- Concatenate 2 strings
The example shows how subquery results can be handled as a table, aliasing of field and tablenames, a case statement and inner joins. Example query
select int_id,
'fieldspec1' as Alias,
(Case
When table1.field1 > 1 And table2.field1 = 'value' Then x
When table1.field1 > 2 And table2.field1 = 'value' Then y
Else z
End) As CaseResult,
SubQuery.fieldname as VALUE_SUBQUERY
from
(Select distinct fieldname,
from table1 tabalias
Inner Join table2 on table2field = tabalias.field1
Inner Join table3 on table3field = table2field
And table3filed = avalue
Where (field1 > 1value And (field2 = 1 And field3 = 'value'))
or (field1 > avalue )
) as SubQuery
Inner Join jointable1 On jointable1.field2 = subquery.field1
Where subquery.field1 <> jointable1.field1