From sys.dm_db_missing_index_details as mid Cross apply sys.dm_db_missing_index_columns (mid.index_handle) Inner join sys.dm_db_missing_index_groups as mig on mig.index_handle=mid.index_handle Order by mig.index_group_handle,mig.index_handle,column_id 1. 2. 3. 4. 5. ---在建立...
The sqlite_stat4.sample BLOB for the WITHOUT ROWID table itself contains just the columns of the primary key. Let the number of columns encoded by the sqlite_stat4.sample blob be N. For indexes on an ordinary rowid table, N will be one more than the number of columns indexed. For ...
"unique" (default = false): Does the column have a unique constraint? "default": The default value of the column if not explicitly given. "primary_key" (default = false): Is this the primary key of this table? Multiple columns can be set as a primary key. "auto_increment" (default...
The statement cannot return multiple rows or columns, but single value (1 x 1) result sets are supported. This class is not thread-safe. Java documentation for android.database.sqlite.SQLiteStatement. Portions of this page are modifications based on work created and shared by the Android Open...
(PAD_INDEX = OFF , STATISTICS_NORECOMPUTE = OFF , IGNORE_DUP_KEY = OFF , ALLOW_ROW_LOCKS = ON , ALLOW_PAGE_LOCKS = ON ) ON ) ON -- 添加维一约束 ALTER TABLE TableDescription ADD CONSTRAINT un_TableDescription_TableName UNIQUE (TableName ) /*** 对象 : Table [dbo].[FieldDescription...
If there are multiple columns, separate them with commas. The name will be properly quoted by the method. return string The SQL statement for adding an unique constraint to an existing table. throws yii\base\NotSupportedException this is not supported by SQLite. Source code ...
[Unique]– Ensures that the values in the underlying database column are unique. Most of these attributes are optional. You should always specify an integer primary key so that selection and deletion queries can be performed efficiently on your data. ...
In this form, the statement will update multiple rows if the account numbers are not unique. function updateItem(first, id) { // UPDATE Cars SET Name='Skoda Octavia' WHERE Id=3; db.transaction(function (tx) { var query = "UPDATE customerAccounts SET firstname = ? WHERE acctNo = ?"...
MultipleInstanceManager MultipleItemsFoundException NamespacedItemResolver Number Once Onceable Optional Pluralizer ProcessUtils Reflector ServiceProvider Sleep Str Stringable Timebox Uri UriQueryString ValidatedInput ViewErrorBag Testing Concerns Constraints ...
"unique"(default = false): Does the column have a unique constraint? "default": The default value of the column if not explicitly given. "primary_key"(default = false): Is this the primary key of this table? Multiple columns can be set as a primary key. ...