AI代码解释 mysql>select*from grade;+---+---+---+---+|id|sno|courseName|grade|+---+---+---+---+|1|202001|高数一|90||2|202003|高数二|88||3|202003|英语一|77||4|202004|英语二|79||5|202002|C++语言设计|87||6|202005|Java面向对象基础|98||7|202006|算法分析与实现|76||8|2...
ALL_SPARSE_COLUMNS <table_constraint> ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] ( column_name [ ASC | DESC ] [ ,... n ] ) [ WITH FILLFACTOR = fillfactor | WITH ( <index_option> [ ,... n ] ) ] [ ON { partition_scheme_...
SQL_ISV_TABLE_CONSTRAINTS = 标识给定用户拥有的表约束。 (中级)SQL_ISV_TABLE_PRIVILEGES = 标识对给定用户可用或授予的永久性表的权限。 (FIPS 过渡级别)SQL_ISV_TABLES = 标识目录中定义的持久表,该表可由给定用户访问。 (FIPS 过渡级别)SQL_ISV_TRANSLATIONS = 标识可由给定用户访问的目录的字符翻译。 (...
ALL_SPARSE_COLUMNS <table_constraint> ::= [ CONSTRAINT constraint_name ] { { PRIMARY KEY | UNIQUE } [ CLUSTERED | NONCLUSTERED ] ( column_name [ ASC | DESC ] [ ,... n ] ) [ WITH FILLFACTOR = fillfactor | WITH ( <index_option> [ ,... n ] ) ] [ ON { partition_scheme_...
ALTER TABLE table_constraints メモリ最適化テーブルの構文 syntaxsql コピー ALTER TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } { ALTER COLUMN column_name { [ type_schema_name. ] type_name [ ( { precision [ , scale ] } ) ] [ COLLATE coll...
设置跟踪标志 8239 时, safe_cleanup_version() 将忽略小于清理点的值,并在重新运行 sys.sp_flush_commit_table_on_demand后运行清理。 使用此跟踪标志不正确可能会导致数据损坏。 有关详细信息,请参阅 排查更改跟踪自动清理问题。 适用于: SQL Server 2022 (16.x) CU 3 及更高版本。范围:仅全局。 8284 ...
SQL UNIQUE Constraint on CREATE TABLE 下面的 SQL 在“Persons” 表创建时在 “Id_P” 列创建 UNIQUE 约束: MySQL: CREATETABLEPersons(Id_PintNOTNULL,LastNamevarchar(255)NOTNULL,FirstNamevarchar(255),Addressvarchar(255),Cityvarchar(255),UNIQUE(Id_P)) ...
query should show you all the constraints on a table:to get all the constraints for the table....
\error.log" objBL.CheckConstraints = True objBL.SchemaGen = True objBL.SGDropTables = True objBL.XMLFragment = True ' Open a connection to the instance of SQL Server to get the source data. objConn.Open "provider=SQLOLEDB;server=(local);database=tempdb;integrated security=SSPI" Set obj...
SQL constraints are the restrictions on the type of data entered into a database table. Constraints are helpful in enforcing accuracy and reliability in the data through certain conditions. Constraints can be applied both in column level that is it is applied on a single column and in table le...