WITH temp_table AS ( SELECT column1, column2 FROM source_table WHERE condition ) INSERT INTO target_table (column1, column2) SELECT column1, column2 FROM temp_table; 在这个示例中,我们首先使用SELECT语句创建一个临时表temp_table,然后将temp_table中的数据插入到目标表target_table中。 需要注意的...
len(@valueStr1)-3)+')''';SELECT@sqlstr=@sqlstr+@colsStr+@valueStr1+'AS sql FROM'+@tablename+'WHERE 1=1 AND'+isnull(@con,'1=1');IF@isDebug=1BEGINPRINT'1.columns string:'+@colsStr;PRINT'2.values string:'+@valueStr1PRINT'3.'+@sqlstr;ENDEXEC(@sqlstr);...
] table_or_view_name } <dml_table_source> ::= SELECT FROM ( <dml_statement_with_output_clause> ) [AS] table_alias [ ( column_alias [ ,...n ] ) ] [ WHERE <search_condition> ] [ OPTION ( <query_hint> [ ,...n ] ) ] syntaxsql Copy -- External tool only syntax INSE...
1. **Statement**:用于执行静态 SQL 语句(不含参数),无法直接处理占位符 `?`,需要手动拼接参数,易导致 SQL 注入风险。 2. **PrepareStatement**:专为预编译 SQL 设计,支持占位符 `?`,可通过方法(如 `setString`)安全填充参数,提升效率和安全性。适合题目中的 SQL。 3. **CallableStatement**:用于调用...
WHERE <search_condition> 這是包含有效 <search_condition> 的任何 WHERE 子句,可篩選 <dml_statement_with_output_clause> 傳回的資料列。 如需詳細資訊,請參閱搜尋條件 (Transact-SQL)。當 <search_condition> 用於此內容時,不能包含子查詢、執行資料存取的純量使用者定義函數、彙總函數、TEXTPTR 或全文檢索...
We can use theWHEREclause withINSERT INTOto copy those rows that match the specified condition. For example, -- copy rows that satisfy the conditionINSERTINTOOldCustomersSELECT*FROMCustomersWHEREcountry ='USA'; Run Code Here, the SQL command only copies those rows whose country column value isUS...
DELETEFROMCOMPANYWHEREAGEIN(SELECTAGEFROMCOMPANY_DKPWHEREAGE>27); 最后COMPANY 表中的记录如下: 5 更新字段 UPDATE 语法 以下是 UPDATE 语句修改数据的通用 SQL 语法: UPDATEtable_nameSETcolumn1=value1, column2=value2..., columnN=valueNWHERE[condition]; 我们...
SQL Server : INSERT with a conditionTry using if not exists
WHERE <search_condition> É qualquer cláusula WHERE que contém um <search_condition> válido que filtra as linhas retornadas por <dml_statement_with_output_clause>. Para obter mais informações, confira Condição de Pesquisa (Transact-SQL). Quando usado nesse contexto, <search_...
] table_or_view_name } <dml_table_source> ::= SELECT FROM ( <dml_statement_with_output_clause> ) [AS] table_alias [ ( column_alias [ ,...n ] ) ] [ WHERE <search_condition> ] [ OPTION ( <query_hint> [ ,...n ] ) ] syntaxsql Copy -- External tool only syntax INSE...