sql - How to use PIVOT clause over blank values -

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sample data:

data table1: prodid  type location(there more columns, ignoring them example) p001        t1      l1 p002        t1      l2 p003        t3      l1 p004        t2       p005        t1      l1  need summary type    blank [l1]  [l2] t1      0           2           1 t2      1           0           0 t3      0           1           0

the problem facing blank values in location field. donno how represent blank location values in pivot query.

pivot query: 1: select type, [] blank, [l1], [l2], blank + [l1] + [l2] total 2: (select type, location table1) 3: pivot  4: (count(location) location in ([],[l1],[l2]) t2  error on line 1 & 4 object or column name missing or empty. select statements, verify each column has name. other statements, empty alias names. aliases defined "" or [] not allowed. add name or single space alias name.

how swapping out null/blank locations dummy value. change

select type, location table1

to

select type, case when location null 'zz' else location end location table1

then column zz or whatever dummy value choose


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