Query OK, 0 rows affected (0.07 sec) 1. 2. 解决方案1 既然"sql_require_primary_key"参数控制了强制检验主键,而且又是可动态修改的,临时关闭,再打开即可, bisal@mysqldb: [test]> alter table t_primary_key drop primary key; ERROR 3750 (HY000): Unable to create or change a table without a pr...
bisal@mysqldb: [(none)]> set sql_require_primary_key = ON;Query OK, 0 rows affected (0.02 sec) bisal@mysqldb: [(none)]> show variables like '%sql_require%';+---+---+| Variable_name | Value |+---+---+| sql_require_...
(DM)SQLExecute、SQLExecDirect、SQLBulkOperations或SQLSetPos已为StatementHandle调用,并返回SQL_NEED_DATA。 在针对所有数据执行参数或列发送数据之前调用了此函数。 HY013内存管理错误无法处理函数调用,因为无法访问基础内存对象,可能是由于内存不足。 HY090无效的字符串或缓冲区长度(DM) 其中一个名称长度参数的值小...
SQLPrimaryKeys() returns a list of column names that comprise the primary key for a table. The information is returned in an SQL result set, which can be retrieved using the same functions that are used to process a result set that is generated by a query. Unicode (UTF-16) equivalent:...
CREATE DATABASEprimary_keys; Copy If the database was created successfully, you’ll receive output like this: Output Query OK, 1 row affected (0.01 sec) To select theprimary_keysdatabase, run the followingUSEstatement: USEprimary_keys; ...
SQLPrimaryKeys()returns a list of column names that comprise the primary key for a table. The information is returned in an SQL result set, which can be retrieved using the same functions that are used to process a result set generated by a query. ...
主键(primary key)- 一列(或一组列),其值能够唯一标识表中每一行。 SQL 语法 SQL(Structured Query Language),标准 SQL 由 ANSI 标准委员会管理,从而称为 ANSI SQL。各个 DBMS 都有自己的实现,如 PL/SQL、Transact-SQL 等。 SQL 语法结构 SQL 语法结构包括: ...
mysql>ALTERTABLEscoreADDremarksVARCHAR(1000)NULLDEFAULT'无';QueryOK,0rowsaffected(0.04sec)Records:0Duplicates:0Warnings:0 上面的命令就完成了数据列的插入;下面查看新增列之后的表结构: 代码语言:javascript 复制 mysql>describe score;+---+---+---+---+---+---+|Field|Type|Null|Key|Default|Extra...
SQL_PROCEDURE_TERM 1.0 包含过程数据源供应商名称的字符串;例如,“database procedure”、“stored procedure”、“procedure”、“package”或“stored query”。 SQL_PROCEDURES 1.0 字符串:如果数据源支持过程,并且驱动程序支持 ODBC 过程调用语法,则为“Y”;否则为“N”。 SQL_QUOTED_IDENTIFIER_CASE 2.0 SQLUSM...
In this article, we are going to learnhow to write a SQL Query to add primary key to a column? Submitted byManu Jemini, on March 14, 2018 Primary key:This key is used to define the uniqueness of column as there always should be a unique row of data for this column. ...