sql - How can I make count() as a condition when I update a table? - 


select count(tableid)  diningtable isavail = 1;

i can "number of table" logically, want use number in next sql query.

update diningtable set isavail = 0 tableid = 11 - [should number of table, result above];

what can do?

make sure put isnull() check avoid null error if first select return 0 rows

update diningtable set isavail = 0 when tableid = 11 - (select isnull(count(tableid),0) diningtable isavail = 1);

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