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Results tagged with ddl
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user 1192
Data Definition Language; defining database structures but not their contents.
11
votes
Accepted
How to create a partitioned table based on date?
As the error message says, any partition-aligned unique index has to include the partitioning key in the index key. This requirement exists so the engine can enforce uniqueness on updates without che …
- 90.2k
17
votes
Accepted
Does SQL Server allow (make visible) DDL inside a transaction to the transaction prior to co...
Common workarounds involve dynamic code (as in Joe's answer), or separating the DML and DDL into separate batches. … With regard to SQL Server, there is a school of thought that says mixing DDL and DML in a transaction is not a great idea. …
- 90.2k
5
votes
What effect does serializable isolation level have on DDL-statements?
I know what it does to dml-statements, but I'm not sure what it means for ddl.
Generally speaking, not much. … DDL encompasses a huge range of operations (many of which have their own special behaviours), but most DDL will take a schema modification (Sch-M) lock on the underlying object, either for the duration …
- 90.2k
9
votes
Accepted
SQL Server Concurrent Inserts and Deletes
The UPDLOCK, SERIALIZABLE pattern is all about avoiding incorrect results (including false key violation errors) due to race conditions, when performing a particularly common operation known as an UPS …
- 90.2k
6
votes
Constraint to enforce "at least one" or "exactly one" in a database
If you can add a column to the table, the following scheme would almost1 work:
CREATE TABLE emails
(
UserID integer NOT NULL,
EmailAddress varchar(254) NOT NULL,
IsActive boolean NOT NUL …
- 90.2k