Pl/sql if 语句

Question

我熟悉 tsql 但不太熟悉 plsql 我怎样才能让这个查询在 pl sql 中工作？

DECLARE 
DATENUM INT := 1;

begin
 if DATENUM = 1 
        then 
             select 'one' as test from dual;
        else 
            select 'two' as test from dual;

end if;

end;

我刚得到下面的错误

[Error] Script lines: 1-15 -------------------------
 ORA-06550: line 7, column 14:
PLS-00428: an INTO clause is expected in this SELECT statement
ORA-06550: line 9, column 13:
PLS-00428: an INTO clause is expected in this SELECT statement
 Script line 7, statement line 7, column 14

eidt:

我想做的是运行基于条件的查询

例如 - 如果是本月的第一天，则 select * 来自 stackdb 如果是本月 5 日，则 select * 来自 adiffdb 等

Answer 1

这不是因为 if 语句，而是因为您需要为 select 中的值指定一个结果变量。否则您只会执行一个虚拟查询。

DECLARE 
  DATENUM INT := 1;
  DATENAME varchar2(5);
begin
  if DATENUM = 1 then 
    select 'one' into DATENAME as test from dual;
  else 
    select 'two' into DATENAME as test from dual;
  end if;
end;

Pl/sql if 语句

Pl/sql if statement

sql

plsql