STRING_AGG 函数可以将指定列或表达式的值连接为一个字符串,并使用指定的分隔符分隔各个值。 例如,假设有一个名为 numbers 的表,其中包含一个 number 列,存储了一组数字。要将这些数字连接为一个字符串,可以使用以下 SQL 查询: SELECT STRING_AGG(number, ',') AS concatenated_numbers FROM numbers; 复制代码...
该回答中第一个是创建了numbers这个数据表,可以参考,这里更推荐第二种方法(类似上面的脚本) 3、反向操作(多行内容合并) 如果将以上进行反向操作,如下图所示: 该问题,在MySQL中可以使用 GROUP_CONCAT函数,使用方法如下: SELECT person_id, GROUP_CONCAT(hobbies SEPARATOR ', ') FROM peoples_hobbies GROUP BY ...
Number,1)ASINT)ASNumberValue,Number+1ASNumberFROM(SELECT'abc123def456'ASStringValue)ASSourceCROSSAPPLY(SELECTTOP(LEN('abc123def456'))ROW_NUMBER()OVER(ORDERBY(SELECTNULL))ASNumber)ASNumbersWHEREISNUMERIC(SUBSTRING(StringValue,Number,1))=1)SELECTSTRING_AGG(NumberValue,'')ASAllNumbersFROMNumberCTE...
@InputString)>0BEGINSET@OutputString=@OutputString+SUBSTRING(@InputString,PATINDEX('%[0-9]%',@InputString),1);SET@InputString=STUFF(@InputString,PATINDEX('%[0-9]%',@InputString),1,'');ENDSELECT@OutputStringASExtractedNumbers;
SELECT[DISTINCT] * |列名称[AS] [列别名] ,列名称[AS] [列别名] ,... FROM表名称[表别名] ; 各个子句的执行顺序: 1、FROM--> 2、WHERE --> 3、GROUP BY(HAVING子句)--> 4、SELECT--> 5、ORDER BY--> 执行顺序: 第一步执行FROM字句:表示确定数据来源 ...
SELECT UPPER(LastName) AS SirName FROM Customers UPPER is known as a function. SQL Serverhas many functionsyou can use to perform many types of calculations. We will look into all of them later, but for now, know that you can string several functions together to create a complex expression...
(UCHAR *)"select * from numeric_test",SQL_NTS);// Use SQLBindCol to bind the NumStr to the column that is being retrieved.retcode = SQLBindCol(hstmt1,1,SQL_C_NUMERIC,&NumStr,19,&strlen1);// Get the application row descriptor for the statement handle using//SQLGetStmtAttr.r...
(SQLIdentifierExpr) sqlInListExpr.getExpr(); String fieldName = sqlIdentifierExpr.getName(); List<Object> values = sqlInListExpr.getTargetList().stream().map(this::getValue).collect(Collectors.toList()); JSONDefaultSelect matchSelect = JSONSelectFactory.match(values); return jsonSelectSyntax...
log(sql); // SELECT * FROM users WHERE id = 1Multiple placeholders are mapped to values in the same order as passed. For example, in the following query foo equals a, bar equals b, baz equals c, and id will be userId:var userId = 1; var sql = SqlString.format('UPDATE users ...
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