在Postgresql中動態創建TEMP TABLE並在FOR循環中選擇相同的表。但得到PIPE符號附近的錯誤

Question

do 
$xyz$ 
declare 
y text; 
i record; 
begin 
y := to_char(current_timestamp, 'YYYYMMDDHHMMSS'); 
raise notice '%',y; 
execute 'CREATE TEMP TABLE someNewTable' 
    ||y 
    ||' AS select * from (VALUES(0::int,-99999::numeric), (1::int,  100::numeric)) as t (key, value)'; 

    for i in (select * from someNewTable||y) loop 
    raise notice '%',i.key; 
    end loop; 
    end; 
    $xyz$ language 'plpgsql' 


ERROR: syntax error at or near "||" 
LINE 13: for i in (select * from someNewTable||y) loop 

我不明白爲什麼錯誤在PIPE符號。請幫幫我。我一直在Oracle數據庫中嘗試，但同樣的錯誤。我在這裏做錯了什麼？

Answer 1

在for ... loop聲明中的查詢也必須是動態的，所以您應該使用execute兩次。

使用format()功能，該功能結合很方便的與execute：

do $xyz$ 
declare 
    y text; 
    i record; 
begin 
    y := to_char(current_timestamp, 'YYYYMMDDHHMMSS'); 
    raise notice '%', y; 
    execute format($ex$ 
     create temp table somenewtable%s 
     as select * from (
      values 
       (0::int, -99999::numeric), 
       (1::int, 100::numeric) 
      ) as t (key, value) 
     $ex$, y); 

    for i in 
     execute format($ex$ 
      select * from somenewtable%s 
      $ex$, y) 
    loop 
     raise notice '%',i.key; 
    end loop; 
end; 
$xyz$ language 'plpgsql';