Updating columns in sql
You can use multiple UPDATE statements, each with a different expression.
However, each UPDATE statement can have only one WHERE clause.
proc sql; update sql.newcountries set population=population*1.05 where name like 'B%'; update sql.newcountries set population=population*1.07 where name in ('China', 'Russia'); title "Selectively Updated Population Values"; select name format=., capital format=., population format=comma15.0 from sql.newcountries; Selectively Updated Population Values Name Capital Population ------------------------------------------------------ Brazil Brasilia 168,325,875 China Beijing 1,286,370,132 India New Delhi 929,009,120 Indonesia Jakarta 202,393,859 Russia Moscow 161,666,278 United States Washington 263,294,808 If you omit the ELSE clause, then each row that is not described in one of the WHEN clauses receives a missing value for the column that you are updating.
-- Indicate this by changing their job (JOB) to NULL and their pay -- (SALARY, BONUS, COMM) values to zero in the EMPLOYEE table.
A searched update statement depends on the table being updated, all of its conglomerates (units of storage such as heaps or indexes), all of its constraints, and any other table named in the WHERE clause or SET expressions.
This happens because the CASE expression supplies a missing value to the SET clause, and the Population column is multiplied by a missing value, which produces a missing value.
While you are updating or inserting rows in a table, you might receive an error message that the update or insert cannot be performed.
Search for updating columns in sql:
In other words, a target row shouldn't join to more than one row from the other table(s).