Does anyone see what's wrong with this code for SQL Server?
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) 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;
When I run this, I get:
Msg 207, Level 16, State 1, Line 3
Invalid column name 'OPT_LOCK'.
on the update command.
Thanks.
An invalid column name error in SQL means that the column name violates the conditions of the column name. If you reference an object that does not exist in the table or the name exists, but you did not reference it correctly, you will get this error.
Rename MySQL Column with the CHANGE Statement Enter the following command in your MySQL client shell to change the name of the column and its definition: ALTER TABLE table_name CHANGE old_column_name new_col_name Data Type; You can change the data type of the column or keep the existing one.
One of the simplest ways to solve an “ambiguous name column” error — without changing column name — is to give the tables you want to join an alias. This sends a clear information to the SQL Machine the columns are different. Happy querying.
In this case you can avoid the problem by adding the column as NOT NULL
and setting the values for existing rows in one statement as per my answer here.
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 GO
in the client tools) or perform it in a child scope that is compiled separately by using EXEC
or EXEC sp_executesql
.
The first approach would require you to refactor your code as an IF ...
cannot span batches.
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;
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