alter table then update in single statement

问题

I have a requirement where I need to Alter (Add 2 columns) and then update the same table.

Here is the query I tried:

ALTER TABLE A
ADD c1 int,c2 varchar(10)

UPDATE  A set c1 = 23, c2 = 'ZZXX'

I need to run the above two queries at a time.

I am using Talend ETL tool, in this we have a component tMssqlrow, which allow us to run multiple queries (I am using 10 to 15 update queries in single component).

But the above query is not working.

I tested in DataBase Microsoft SQL. i am getting the below error :

Msg 207, Level 16, State 1, Line 5

Invalid column name 'c1'. Msg 207,

Level 16, State 1, Line 5

Invalid column name 'c2'.

can any one help me resolve this problem.

回答1:

You can't do this exactly in a single statement (or batch) and it seems the tool you are using does not support GO as a batch delimiter.

You can use EXEC to run it in a child batch though.

ALTER TABLE A
  ADD c1 INT, c2 VARCHAR(10);

EXEC('
UPDATE A
SET    c1 = 23,
       c2 = ''ZZXX'';
    ');

NB: All single quotes in the query need to be doubled up as above to escape them inside a string literal.

Or alternatively you could achieve similar results in a single statement with the aid of some default constraints.

ALTER TABLE A
  ADD c1 INT NULL CONSTRAINT DF_A_c1 DEFAULT 23 WITH VALUES, 
     c2 VARCHAR(10) CONSTRAINT DF_A_c2 NULL DEFAULT 'ZZXX' WITH VALUES;

But this is not exactly the same as the original query as the default constraints will be left behind and may need to be dropped.

回答2:

Use GO between your 2 queries.

回答3:

Try this

ALTER TABLE A ADD c1 int,c2 varchar(10)

GO

UPDATE  A set c1 = 23, c2 = 'ZZXX'

GO

来源：https://stackoverflow.com/questions/15740997/alter-table-then-update-in-single-statement

标签

sql

sql-server

database

etl

talend