在SQL Server 2012里期待已久的安全功能是用户自定义服务器角色。对于数据库级别的许可(在这篇文章里你马上就会学到),SQL Server拥有一直灵活的用户自定义数据库角色,但使用自定义服务器角色,最终你可以获得和服务器级别一样颗粒的许可。 在早期的SQL Server版本里,唯一授予一些许可到用户是分配它们到呢间的固定服务...
In the SQL Server, theUNIONoperator concatenates the resultsets of the two tables and it eliminates the duplicated rows from the resultset. In fact, theUNIONoperator in SQL Server acts as like as the union operation in theSetTheory. Suppose that,AandBsets are represented by tables in SQL S...
Applies to: SQL Server 2012 (11.x) only. Clustered Index Delete The Clustered Index Delete operator deletes rows from the clustered index specified in the Object property, listed in the Properties pane of the graphical and XML showplans. If a SeekPredicate or Predicate is present, then only...
The SQL AND Operator TheWHEREclause can contain one or manyANDoperators. TheANDoperator is used to filter records based on more than one condition, like if you want to return all customers from Spain that starts with the letter 'G':
how to use theLIKEoperator to filter data based on a string pattern containing wildcard characters, follow our guide onHow To Use Wildcards in SQL. Lastly, if you’d like to learn more aboutWHEREclauses generally, you may be interested in our tutorial onHow To Use WHERE Clauses in SQL...
If a disk-based rowstore index is created with key columns that match those in the ORDER BY clause in the query, the SORT operator can be eliminated in the query plan and the query plan is more efficient.SQL Copy CREATE NONCLUSTERED INDEX IX_PurchaseOrderDetail_RejectedQty ON Purchas...
Three-valued logic has been in the SQL standard from the beginning. It is an integral and widely supported aspect of SQL. SQL:1999 added two related optional features: F571, “Truth value tests”: extends the is operator for all three logical values. T031, “BOOLEAN data type”: defines...
String function or operatorWith an SCA collationWithout an SCA collation CHARINDEXLENPATINDEX The UTF-16 surrogate pair is counted as a single code point. The UTF-16 surrogate pair is counted as two code points. LEFTREPLACEREVERSERIGHTSUBSTRINGSTUFF These functions treat each surrogate pair as a ...
SQL INSERT INTO Statement WHERE Clause in SQL SQL UPDATE Statement SQL DELETE Statement DELETE Query and TRUNCATE Function in SQL LIKE and BETWEEN Operators in SQL SQL BETWEEN Operator(With Syntax and Examples) How to Use the SQL EXISTS to Check for the Existence of Data? GROUP BY and ORDER...
SQL INSERT INTO Statement WHERE Clause in SQL SQL UPDATE Statement SQL DELETE Statement DELETE Query and TRUNCATE Function in SQL LIKE and BETWEEN Operators in SQL SQL BETWEEN Operator(With Syntax and Examples) How to Use the SQL EXISTS to Check for the Existence of Data? GROUP BY and ORDER...