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PO
primarykey
Id
12535472
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2012-09-21T17:40:22.123
FavoriteCount
0
LastActivityDate
2012-09-21T17:57:41.270
LastEditDate
2017-05-23T11:54:15.993
LastEditorUserId
-1
OwnerUserId
73226
ParentId
12535405
PostTypeId
2
Score
36
ViewCount
0
LastEditorDisplayName
text
Body
In this case you can avoid the problem by adding the column as <code>NOT NULL</code> and setting the values for existing rows in one statement <a href="https://stackoverflow.com/a/12472606/73226">as per my answer here</a>. More generally the problem is a parse/compile issue. SQL Server tries to compile all statements in the batch before executing any of the statements. When a statement references a table that doesn't exist at all the statement is subject to deferred compilation. When the table already exists it throws an error if you reference a non existing column. The best way round this is to do the DDL in a different batch from the DML. If a statement both references a non existing column in an existing table and a non existent table the error may or may not be thrown before compilation is deferred. You can either submit it in separate batches (e.g. by using the batch separator <code>GO</code> in the client tools) or perform it in a child scope that is compiled separately by using <code>EXEC</code> or <code>EXEC sp_executesql</code>. The first approach would require you to refactor your code as an <code>IF ...</code> cannot span batches. <pre><code>IF NOT EXISTS(SELECT * FROM sys.columns WHERE Name = 'OPT_LOCK' AND object_ID = Object_id('REP_DSGN_SEC_GRP_LNK')) BEGIN ALTER TABLE REP_DSGN_SEC_GRP_LNK ADD OPT_LOCK NUMERIC(10, 0) EXEC('UPDATE REP_DSGN_SEC_GRP_LNK SET OPT_LOCK = 0'); ALTER TABLE REP_DSGN_SEC_GRP_LNK ALTER COLUMN OPT_LOCK NUMERIC(10, 0) NOT NULL END; </code></pre>
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1. POInvalid column name on sql server update after column create
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1. USMartin Smith
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