Question

我对sql查询还很陌生我在存储过程中有一个with语句，之后有一个while循环然后在while循环中，我选择了with语句来显示它。

但它说

无效的对象。

我的代码是

DECLARE @i INT
SET @i=0
BEGIN
WITH t1 AS (
SELECT * FROM Dams)
WHILE @i<3
BEGIN
Select * from t1
SET @i = @i+1
END
END

Answer 1

您必须在公用表表达式之后编写选择查询：

DECLARE @i INT
SET @i=0
BEGIN
    WHILE @i<3
    BEGIN
        WITH t1 AS (
        SELECT * FROM Dams)    
        Select * from t1

        SET @i = @i+1
    END
END

Answer 2

您不需要position = "low" if marker.pose.position.z > 1 and position=="low": os.system("cd ~/catkin_ws_artag/src/launch && roslaunch pr2_indiv_1.launch") posicion = "high" print "HIGH" ################################ if marker.pose.position.z < 1 and position=="high": os.system("cd ~/catkin_ws_artag/src/launch && roslaunch pr2_indiv_0.launch") posicion = "low" print "LOW"循环。

事实上，您可以简单地做到：

while

SQL：我的With语句在while循环内不起作用

2 个答案: