First, IF statement condition is TRUE. It prints the message inside the IF statement block 首先,IF语句条件为TRUE。 它在IF语句块内打印消息 Second, IF statement condition is FALSE, it does not print the message inside IF statement block 其次,IF语句条件为FALSE,它不会在IF语句块内打印消息 It ex...
The following example uses an if statement to check if a query returns any rows: do $$ declare selected_film film%rowtype; input_film_id film.film_id%type = 0; begin select * from film into selected_film where film_id = input_film_id; if not found then raise notice'The film % co...
在SQL中,IF语句通常与BEGIN和END语句一起使用,形成一个代码块。它的基本语法如下: 代码语言:txt 复制 IF condition THEN statement1; ELSE statement2; END IF; 其中,condition是一个条件表达式,如果该条件为真,则执行statement1;否则,执行statement2。 IF语句在事务中的应用场景非常广泛,例如: 数据插入前的验证:...
-- Session creates a histogram of the number of lock escalations per database CREATE EVENT SESSION [Track_lock_escalation] ON SERVER ADD EVENT sqlserver.lock_escalation ( SET collect_database_name=1,collect_statement=1 ACTION(sqlserver.database_id,sqlserver.database_name,sqlserver.quer...
The statement that will be executed if the predicate evaluates false. Optional, may be null. C# Көшіру public Microsoft.SqlServer.TransactSql.ScriptDom.TSqlStatement ElseStatement { get; set; } Property Value TSqlStatement Applies to ӨнімНұсқалар Microsoft....
该方法接受一个原生 SQL 查询语句,执行它,并返回一个django.db.models.query.RawQuerySet实例。这个RawQuerySet能像普通的QuerySet一样被迭代获取对象实例。 最好用例子来解释。假设你有以下模型: classPerson(models.Model):first_name=models.CharField(...)last_name=models.CharField(...)birth_date=models.Da...
SQL_PROCEDURE_TERM 1.0 具有程式之數據源廠商名稱的字元字串;例如,“database procedure”、“stored procedure”、“procedure”、“package” 或“stored query”。 SQL_PROCEDURES 1.0 如果數據源支援程式和驅動程序支援 ODBC 程式調用語法,則為字元字串:“Y”。否則為 「N」。。 SQL_QUOTED_IDENTIFIER_CASE 2.0...
qds = 查詢資料存放區 (Query Data Store) sni = 伺服器網路介面 (Server Network Interface) ucs = 整合通訊堆疊 (Unified Communications Stack) xtp = 極端交易處理 (extreme transaction processing) C.2 每個物件類型的計數 本節會告訴我們事件封裝包含的物件類型。 顯示sys.dm_xe_objects所有物件類型的完整...
I'm having trouble with using an IF statement within this sql-server query. What I want: If salesHeader.[Ship-to Name] isn't null, I need to return that AS DeliveryName, if it is null, return something else. Is there a way to do this with an if statement in a query? SELECT po...
();//动态列 Statement stmt = null; ResultSet rs = null; public JResponseObject QueryObject(JParamObject PO, JQueryStubObject QO, JConnection conn) throws Exception { JResponseObject RO = null; this.conn = conn; this.PO = PO; /*根据统计分类创建不同的临时表(动态创建列)*/ dwbh = PO...