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 ...
If you use theAUTOINCclause to turn on autoincrementing for a field and specify a default value, Visual FoxPro stores the default value in the table but does not use it. Visual FoxPro uses the default value if you use the SQLALTER TABLEcommand to remove autoincrementing for the field. ...
CREATE TABLE - SQL Command Article 11/14/2006 Creates a table using the specified fields or from an array. Copy CREATE TABLE | DBF TableName1 [NAME LongTableName] [FREE] ( FieldName1 FieldType [( nFieldWidth [, nPrecision] )] [NULL | NOT NULL] [CHECK lExpression1 [ERROR cMessageTe...
Note Candidate indexes, created by including the UNIQUE option (provided for ANSI compatibility) in CREATE TABLE – SQL or ALTER TABLE – SQL commands, are not the same as indexes created in the INDEX command with the UNIQUE option. An index created in the INDEX command using the UNIQUE opti...
or specifications for a function or procedure in theDescribetab. Select links in the Describe results to write that information into the command editor. For example, click a table name to addowner.table, click a column name to add thecolumn name, click a procedure or function name to add th...
CREATETABLEbookshelf(BOOK_IDNUMBER,BOOK_NAMEVARCHAR2(100),BOOK_TYPEVARCHAR2(100),AUTHORVARCHAR2(100),INTIMEDATE); 表名为:bookshelf,有列:图书id,图书名称,图书类型,作者,入库时间。通过上面学习的SELECT语法,来查询一下这张表: SELECT * FROM bookshelf; ...
empty_lobs_are_null--setempty LOBs tonull(DefaultFALSE)defaults--direct pathdefaultvalue loading;EVALUATE_ONCE,EVALUATE_EVERY_ROW,IGNORE,IGNORE_UNSUPPORTED_EVALUATE_ONCE,IGNORE_UNSUPPORTED_EVALUATE_EVERY_ROWdirect_path_lock_wait--waitforaccess to table when currentlylocked(DefaultFALSE)PLEASENOTE:Command-...
SELECT'USE '+QUOTENAME(@dbname) +'; CHECKPOINT'ASCheckpointCommand;SELECT'SELECT * FROM sys.dm_db_log_info('+CONVERT(VARCHAR, @database_id) +')'ASVLF_LogInfo;ENDELSEIF(@log_reuse_wait =2)BEGINSELECT'Is '+ @recovery_model_desc +' recovery model the intended choice ...
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d4a1999ef83e mcr.microsoft.com/mssql/server:2022-latest "/opt/mssql/bin/perm..." 2 minutes ago Up 2 minutes 0.0.0.0:1433->1433/tcp, :::1433->1433/tcp sql1 如果STATUS列显示Up状态,则 SQL Server 正在容器中运行,并且在侦听PORTS列中...
The TableDirect // type is only for OLE DB. cmd.CommandType = commandType; cmd.Parameters.AddRange(parameters); conn.Open(); return cmd.ExecuteNonQuery(); } } } // Set the connection, command, and then execute the command and only return one value. public static Object ExecuteScalar(...