共返回1 行记录,花费 5 ms。 2. 场景解析 从查询条件中可以看出 token 和 uid 过滤性都非常好,但是由于使用了 or, 需要采用 index merge 的方法才能获得比较好的性能。但在实际执行过程中MySQL优化器默认选择了使用registrationId 上的索引,导致 SQL 的性能很差。 3. 场景优化 我们将
SELECT * FROM table_name WHERE condition1 OR condition2; 在上述查询中,table_name是要查询的表名,condition1和condition2是两个条件。如果满足condition1或者condition2中的任意一个条件,该行将被返回。 SQL QUERY中使用OR操作符的优势是可以扩展查询条件,使得查询更加灵活。通过使用OR操作符,可以在一个查询中...
You execute a query that contains a search condition with, at least, two equality predicates on the same limited size character column (using either OR or IN clause). You define a varchar(max) variable and use it in...
Semaphore timeout: This error points to a timeout condition related to the use of semaphores in the network. The Wait Operation Timed Out: A wait operation has exceeded its allowed time, typically due to network delays. A fatal error occurred while reading the input stream from the ne...
AndCondition Class Argument Class BetweenLeafCondition Class BooleanLeafCondition Class Condition Class ConditionTree Class ConstantValue Class ExpressionOperator Enumeration ExpressionValue Class FieldValue Class FilterAction Enumeration FilterRule Class FilterStatement Class FunctionValue Class InputType Class IsNull...
SQL Copy UPDATE table1 set col3 = 'Dallas' where col1 = 3 The log reader generates only the INSERT stored procedure call, since the row didn't previously meet the filter condition. Although an UPDATE operation was performed at the Publisher, only the appropriate commands are applied at ...
Applies to:SQL Server Use this dialog box to create or change a Policy-Based Management condition. A condition is a Boolean expression that specifies a set of allowed states of a Policy-Based Management managed target with regard to facets. The properties tha...
400 ManagedInstanceNoConditionToMakeDatabaseAccessible -作无法完成,因为没有足够的权限启动托管实例上的可访问工作流 {0}。 400 UmiMissingAkvPermissions - 用户提供的 PrimaryUserAssignedIdentityId 无权访问提供的 KeyId 400 SameKeyUriNotFoundOnRemoteServer - 辅助服务器没有与启用了密钥自动轮换的主服务器的...
The OR command is used with WHERE to include rows where either condition is true.The following SQL statement selects all fields from "Customers" where city is "Berlin" OR city is "München":ExampleGet your own SQL Server SELECT * FROM Customers WHERE City='Berlin' OR City='München'; ...
It can be used with direct import into PostgreSQL under the same condition but -j or JOBS must also be unset or default to 1. CREATE_OR_REPLACE By default Ora2Pg uses CREATE OR REPLACE in functions and views DDL, if you need not to override existing functions or views disable this ...