使用@temp表变量插入SQL Server

Question

I wanted to check if something like this is possible. I have a table variable with just Yes and No . I want to create a select query using this (basically cross join) , and than use this select query to insert all the data in a table

DECLARE @testTable TABLE (testTable nvarchar(3))

INSERT INTO @testTable VALUES ('Yes')
INSERT INTO @testTable VALUES ('No')

INSERT INTO DimLifeEventFlags_Stage_1
(
Select 
    LET.ID AS eID,
    LERS.ID AS cID,
    DYLE.testTable AS testTable
from 
    mainTable1 LERS, 
    mainTable2 LET , 
    @testTable DYLE
    )

Answer 1

There no reason you can't do what you're doing but if I were writing this I would Use CROSS JOIN join to be explicit. CROSS JOIN also makes it easier if your mixing in LEFT or INNER joins.

I would also not use the temp table at all and instead use the values clause

INSERT INTO DimLifeEventFlags_Stage_1
(
Select 
    LET.ID AS eID,
    LERS.ID AS cID,
    DYLE.testTable 
from 
    mainTable1 LERS  
    CROSS JOIN mainTable2 LET 
    CROSS JOIN (Values ('Yes'), 
                        ('No') 
                ) as DYLE (testTable )
    )