在另一个SQL查询中使用声明的变量

Question

I want to use my insert query's Id in another query by declaring variable like below. However second query does not see declared variable. How can I use my first insert's Id in second insert query

DECLARE @myVariable table (PKProductVariantId INT)
INSERT INTO STProductVariant
(FKProductId,FKProductDetailValueId_,ProductVariantCode,IsActive,StockQuantity)
OUTPUT inserted.PKProductVariantId into @myVariable
values(1,1,'test',1,1) 

Then

insert into STBranchProductVariantRelation(FKProductVariant,FKBranch,IsActive)
values (@myVariable,1,1)

Answer 1

You want to use the pk from the inserted row in STProductVariant? Try this:

INSERT INTO STProductVariant (...) VALUES (...);
SET @lastId := LAST_INSERT_ID();
INSERT INTO STBranchProductVariantRelation (FKProductVariant, FKBranch, IsActive)
VALUES (@lastId, 1, 1);

Answer 2

You need to use insert . . . select insert . . . select insert . . . select :

insert into STBranchProductVariantRelation(FKProductVariant, FKBranch, IsActive)
    select t.PKProductVariantId, 1, 1
    from @myVariable t; 

I think you are confusing your self by naming a table variable a "variable". You are then thinking it is a scalar variable.

I would write this code as:

DECLARE @ids table (PKProductVariantId INT);

INSERT INTO STProductVariant
(FKProductId, FKProductDetailValueId_, ProductVariantCode, IsActive, StockQuantity)
    OUTPUT inserted.PKProductVariantId into @ids
    VALUES(1, 1, 'test', 1, 1); 

    insert into STBranchProductVariantRelation(FKProductVariant, FKBranch, IsActive)
        select i.PKProductVariantId, 1, 1
        from @ids i;