最近在搞一个升级脚本,发现有一张业务表中的某些字段长度需要调整,直接使用alter table alter column进行修改发现修改一列要用十几分钟!!!两三个列那用时简直不能容忍啊!google了一下,相关链接参考文末stackoverflow问答。 测试环境配置 表中数据量100多万; 虚拟机4核16G内存400G硬盘; 优化步骤 1.删除修改列关联...
Edit Column Type ALTERTABLE[Product]ALTERCOLUMN[Name]nvarchar(max); Rename rename table 和 column 是很恐怖的操作. 因为 index, foreign key 都会用 table name 和 column name 命名. 所以它需要批量换 EXECsp_rename'Product','Products';--change table nameEXECsp_rename'Products.Name','NewColumnName'...
sp_changearticlecolumndatatype 用于替代受支持的发布服务器类型(Oracle 和 SQL Server)之间的默认数据类型映射。 若要查看这些默认数据类型映射,请执行 sp_getdefaultdatatypemapping。 sp_changearticlecolumndatatype 仅Oracle 发布服务器支持。 针对 SQL Server 发布执行此存储过程会导致错误。 sp_changearticlecolumn...
I have imported the data into sql server with target column as varchar.Now my target tables(SQL SERVER DB) are now loaded with data.Now I want to change the column data type in target table sql server database from VARCHAR to DATETIME with out interrupting the data.I dont want to d...
DataType 加密 GeneratedAlways IsHidden IsMasked MaskingFunction 選項 StorageOptions 方法 AlterTableAlterIndexStatement AlterTableAlterPartitionStatement AlterTableChangeTrackingModificationStatement AlterTableConstraintModificationStatement AlterTableDropTableElement AlterTableDropTableElementStatement AlterTable...
ALTER TABLE table_name MODIFY column_name NEW_DATATYPE (7) 修改表字段名称 ALTER TABLE table_name CHANGE old_column_name new_column_name DATATYPE (8) 删除表字段 ALTER TABLE table_name DROP old_column (9) 插入数据 INSERT INTO table_name (column1, column2) VALUES (value1, value2); ...
type_name can be: A Microsoft SQL Server system data type. An alias data type based on a SQL Server system data type. Alias data types must be created by using CREATE TYPE before they can be used in a table definition. A Microsoft .NET Framework user-defined type and ...
Assume that you have a table that has a clustered columnstore index in Microsoft SQL Server 2014. You run a DDL query against the table to change the data type of an existing column. For example, you update the data type for Column_1 of Table_1 from VARCHAR (499) to...
Applies to: SQL Server 2016 (13.x) and later Azure SQL Database Azure SQL Managed Instance Analytics Platform System (PDW)You can change the order of columns in Table Designer in SQL Server Management Studio (SSMS). By default, a safety mechanism of SSMS blocks changing the column order. ...
In this scenario, SQL Server will not be able to push the filter predicate closer to the data source operator (table or index scan or seek). This may cause suboptimal query performance. In addition...