Shared (S) Used for read operations that do not change or update data, such as a SELECT statement. Update (U) Used on resources that can be updated. Prevents a common form of deadlock that occurs when multiple sessions are reading, locking, and potentially updating resources...
A table can have multiple UNIQUE constraints. CLUSTERED | NONCLUSTERED Indicates that a clustered or a nonclustered index is created for the PRIMARY KEY or UNIQUE constraint. PRIMARY KEY constraints default to CLUSTERED, and UNIQUE constraints default to NONCLUSTERED. In a CREATE TABLE statement, ...
If the new column allows null values and you add a default definition with the new column, you can use WITH VALUES to store the default value in the new column for each existing row in the table. If the new column doesn't allow null values and the table isn't empty, you have to ...
derived_table can use the Transact-SQL table value constructor feature to specify multiple rows. For example, SELECT * FROM (VALUES (1, 2), (3, 4), (5, 6), (7, 8), (9, 10) ) AS MyTable(a, b);. For more information, see Table Value Constructor (Transact-SQL). column_alias...
在分散式交易中,如果連線已啟用 Multiple Active Result Set (MARS),即無法對回送的連結伺服器發出 execute_statement。如果execute_statement 要以READTEXT 陳述式傳回資料,則每個 READTEXT 陳述式最多可以傳回 1 MB (1024 KB) 的資料。 execute_statement 也可搭配擴充程序使用。 execute_statement 會插入擴充程序...
That’s where the WHERE LIKE clause comes in. In this SQL tutorial, we will discuss the purpose and use of the WHERE LIKE clause in SQL Server and how it can help you construct more efficient queries. We’ll also provide some examples to help illustrate when and how to use this clause...
Error (multiple values) [42, "a", true] none [] Error (no values) [] Consider, for example, ajson_queryquery to retrieve a JSON object. What happens if the path expression matches a JSON scalar value instead of an object, or it matches multiple JSON values (of any kind)...
occurs at the current position of the cursor. This can be more accurate than a searched DELETE statement that uses a WHEREsearch_conditionclause to qualify the rows to be deleted. A searched DELETE statement deletes multiple rows if the search condition does not uniquely identify a single row....
Example - Two Conditions in the WHERE Clause (OR Condition) You can use theOR conditionin the WHERE clause to test multiple conditions where the record is returned if any one of the conditions are met. In this example, we have a table calledproductswith the following data: ...
354 16 No The target '%.*ls' of the INSERT statement cannot be a view or common table expression when the FROM clause contains a nested INSERT, UPDATE, DELETE, or MERGE statement. 355 16 No The target table '%.*ls' of the INSERT statement cannot have any enabled trigg...