CREATE TABLE – SQL Command项目 2006/10/23 Creates a table having the specified fields. 复制 CREATE TABLE | DBF TableName1 [NAME LongTableName] [FREE] (FieldName1 FieldType [(nFieldWidth [, nPrecision])] [NULL | NOT NULL] [CHECK lExpression1 [ERROR cMessageText1]] [DEFAULT e...
CREATE TABLE 陳述式包含 REFERENCES 關鍵字,可建立兩個資料表之間的「外部索引鍵」(FK) 關聯性。 如果您使用 tempdb,請在 --REFERENCES 關鍵字前加上一對破折號進行註解。 ERD 會顯示兩個資料表之間的關聯性。 tabEmployee.DepartmentCode「子」資料行中的值受限於 tabDepartment.DepartmentCode「父」資料行中的值...
Visual FoxPro uses the default value if you use the SQL ALTER TABLEcommand to remove autoincrementing for the field.PRIMARY KEY | UNIQUE PRIMARY KEY creates a primary index for the field specified in FieldName1. UNIQUE creates a candidate index for the field specified in FieldName1. The ...
Can table-valued parameter be null? Can the "print" command be told not to send a "newline"? Can we alias name for temp table Can we creating index on non unique value columns on temporary tables Can we do MAX inside nested CASE Statement? Can we generate pipe delimited column through...
SELECT wg.name AS workload_group_name, rp.name AS resource_pool_name, r.command, r.status, d.name AS database_name, COUNT(1) AS request_count, MIN(r.start_time) AS first_request_start_time, MAX(r.start_time) AS last_request_start_time, SUM(CAST(r.total_elapsed_time AS bigint...
CREATE DATABASE [Test_1] ON PRIMARY ( NAME = N'test_1', FILENAME = N'D:\sqldata\test...
-- Execute a resumable online index create statement with MAXDOP=1 CREATE INDEX test_idx1 ON test_table (col1) WITH (ONLINE = ON, MAXDOP = 1, RESUMABLE = ON); -- Executing the same command again (see above) after an index operation was paused, resumes automatically the index create op...
This topic provides an explanation of the SQL grammar that is used for the CREATE EXTERNAL TABLE command.
the two tables must not be delete-connected to each other where the delete rule of the last relationship in each path is RESTRICT or SET NULL. The delete rule specified in a FOREIGN KEY clause of the CREATE TABLE or ALTER TABLE statement is not valid for the reason specified by thereason...
SQL_TIMESTAMP、SQL_TINYINT、 SQL_TSI_DAY、SQL_TSI_FRAC_SECOND、SQL_TSI_HOUR、SQL_TSI_MICROSECOND、SQL_TSI_MINUTE、SQL_TSI_MONTH、 SQL_TSI_QUARTER、 SQL_TSI_SECOND、SQL_TSI_WEEK、SQL_TSI_YEAR、SQL_VARBINARY、SQL_VARCHAR、STATE、STATEMENT、STRING_AGG、STRUCTURE、STYLE、SUBCLASS_ORIGIN、...