创建表，并使用if语句

Question

我有这个问题，我真的不明白

我需要帮助理解和回答在座它

Answer 1

--Create the table on the fly with the condition stated 
SELECT 
    TEAM_NAME, 
    RACES_COMPETED 
INTO [TOP TEAMS] 
FROM YourTable 
WHERE RACES_COMPETED >= 500 and RACES_COMPETED <= 900 


--Store the number of teams in the new table in a variable for ease of use 
DECLARE @topTeams INT 
SET @topTeams = (SELECT COUNT(*) FROM [TOP TEAMS]) 


--If there are teams in the table, print the number of teams. If there aren't any, print the other statment 
IF @topTeams > 0 
    BEGIN 
     SELECT 'NO. OF TOP TEAMS: ' + CAST(@topTeams AS VARCHAR) 
    END 
ELSE 
    BEGIN 
     SELECT 'NO TOP TEAMS EXIST' 
    END 

是使用TEMP TALBE的相同代码

--Drop the TEMP TABLE if it exists 
IF OBJECT_ID('tempdb..#TOP_TEAMS') IS NOT NULL DROP TABLE #TOP_TEAMS 

--Create the table on the fly with the condition stated 
SELECT 
    TEAM_NAME, 
    RACES_COMPETED 
INTO #TOP_TEAMS 
FROM YourTable 
WHERE RACES_COMPETED >= 500 and RACES_COMPETED <= 900 


--Store the number of teams in the new table in a variable for ease of use 
DECLARE @topTeams INT 
SET @topTeams = (SELECT COUNT(*) FROM #TOP_TEAMS) 


--If there are teams in the table, print the number of teams. If there aren't any, print the other statment 
IF @topTeams > 0 
    BEGIN 
     SELECT 'NO. OF TOP TEAMS: ' + CAST(@topTeams AS VARCHAR) 
    END 
ELSE 
    BEGIN 
     SELECT 'NO TOP TEAMS EXIST' 
    END