php - How to count all records from selected table with empty fields -

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assuming have four tables have select 3 tables database named records

records 1.cases 2.ballistics 3.chem 4.accounts  cases id|year|natureofcase | 0 |    |repact 1901a | 1 |2003|repact 1907b | 3 |2004|repact 1902  |  ballistics id|year|name     |type  | 0 |2003|         |a-101 |  1 |    |silver-a |a-202 | 3 |2005|red cap  |      |  chem id|year|identified   | 0 |    |h20+c20      | 1 |2001|am           | 3 |2009|             |

so have 6 rows empty tables. want display sum 6 using php. thank you. comments/answers/suggestions highly appreciated.

please try this

select     (select count(*) cases year = '' or natureofcase = '') +    (select count(*) ballistics year ='' or name='' or type='') +    (select count(*) chem year='' or identified='') total_empty

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