所以长度过大后导致如下报错: ERROR 1709 (HY000): Index column size too large...DECLARE v_tablename VARCHAR (200) ; -- 用于缓存添加分区时候的sql DECLARE v_sql VARCHAR (5000) ; -- 分区名称定义...V_P_VALUE, ' VALUES IN(', _tenantId, ') ENGINE = INNODB) ' ) ; SET @v_sql = ...
Set-SqlColumnEncryption cmdlet 使用 Always Encrypted 功能加密、解密或重新加密指定的数据库列。 该 cmdlet 接受 SqlColumnEncryptionSettings 对象的数组,每个对象都指定数据库中一列的目标加密配置。 该 cmdlet 将加密、解密或重新加密每个指定列,具体取决于列的当前
5、FIND_IN_SET和like的区别 like是广泛的模糊匹配,字符串中没有分隔符,Find_IN_SET 是精确匹配,字段值以英文”,”分隔,Find_IN_SET查询的结果要小于like查询的结果。
The column has character set latin1 and collation latin1_bin. The CHARACTER SET and COLLATE clauses are standard SQL. If you use ALTER TABLE to convert a column from one character set to another, MySQL attempts to map the data values, but if the character sets are incompatible, there ...
select * from table where DATE_SUB(CURDATE(), INTERVAL 7 DAY) <= date(column_time); 查询一个月: select * from table where DATE_SUB(CURDATE(), INTERVAL INTERVAL 1 MONTH) <= date(column_time); 查询'06-03'到'07-08'这个时间段内所有过生日的会员: ...
Column_name: ID - 索引列 Collation: A - 列怎样在索引中被排序 Cardinality: 6 - 索引中唯一值的数量 Sub_part: NULL Packed: NULL Null: Index_type: BTREE - 索引算法类型 Comment: Index_comment: 1 row in set (0.01 sec) 1. 2. 3. ...
syntaxsql SETANSI_NULLSON Remarks WhenANSI_NULLSis ON, aSELECTstatement that usesWHERE column_name = NULLreturns zero rows even if there are NULL values incolumn_name. ASELECTstatement that usesWHERE column_name <> NULLreturns zero rows even if there are non-NULL values incolumn_name. ...
SQL DELETEdbo.ToolWHEREName='Saw'; GOSELECT*FROMdbo.Tool; GO 尝试插入 3 的显式 ID 值。 SQL INSERTINTOdbo.Tool (ID,Name)VALUES(3,'Garden shovel'); GO 前面的INSERT代码应返回以下错误: 输出 An explicit value for the identity column in table 'AdventureWorks2022.dbo.Tool' can only be speci...
When FMTONLY is ON, a rowset is returned with the column names, but without any data rows. SET FMTONLY ON has no effect when the Transact-SQL batch is parsed. The effect occurs during execution run time. The default value is OFF. Permissions Requires membership in the public role. Example...
resultset 对象获取行字段数据时报:java.sql.SQLException: Column 'id' not found. 代码: String sql="SELECT d.content,c.name AS categoryName FROM news_detail d,news_category c WHERE d.categoryId=c.id"; Object[] params={}; System.out.println(this.executeQuery(sql, params)); ...