根据 FundType 的优先级比较两个表的金额
我有两张表，一张是 PaymentDetail，另一张是 Ledger
在这里，我想优先考虑 paymodetype，首先应考虑现金用于 R、A，然后是 FundType，然后是信用卡，然后是 DD，然后是支票。
我希望收到的现金金额首先应考虑用于 R，然后是 A，最后是 I FundType。另一个例子
这里也是sqlfiddle。只能用SQL解决吗？我不想使用光标。
编辑：
我已经用我尝试过的方法更新了sqlfiddle。我正在尝试使用 join，因为在我的结果中获得了关于 Payment Detail 的多行。我想在 Ledger 上跨越一行付款明细的金额，然后应该使用第二行。我怎样才能做到这一点？当前sqlfiddle 的结果是
我想不出一个合理的方法来满足 T-SQL 非游标解决方案的要求，所以下面是一个返回结果集的 SQLCLR 过程。该解决方案对每个表执行一次扫描（最多）。在具有 500,000 个支付行和 1,000,000 个 Ledger 行的测试中，它使用热缓冲池在 4.8 秒内完成，从冷启动开始需要 5.2 秒 - 包括在 SSMS 中显示 120,000 行结果的时间。
该过程使用EXTERNAL_ACCESS权限集，因此ALTER DATABASE [name] SET TRUSTWORTHY ON;是最简单的测试方法（数据库还必须有一个有效的所有者）。对于部署，您可能更愿意对其进行签名并明确授予权限。我无法将其上传到 SQL Fiddle，因为它的 DDL 语句限制为 8000 个字符。
CREATE ASSEMBLY [dbase]
FROM 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WITH PERMISSION_SET = EXTERNAL_ACCESS;
GO
CREATE PROCEDURE [dbo].[MatchLedgerRecords]
WITH EXECUTE AS CALLER AS
EXTERNAL NAME [dbase].[StoredProcedures].[MatchLedgerRecords];
从您的 SQL Fiddle 复制的示例数据：
CREATE TABLE dbo.PaymentDetail
(
PaymentId integer PRIMARY KEY,
RecptNo integer NOT NULL,
Amount float NOT NULL,
PayModeType varchar(20) NOT NULL
);
CREATE TABLE dbo.Ledger
(
LedgerId integer PRIMARY KEY,
Recptno integer NOT NULL,
FundType char(1) NOT NULL,
amount float NOT NULL
);
INSERT INTO dbo.PaymentDetail
(PaymentId, RecptNo, Amount, PayModeType)
VALUES
(1, 1, 1000, 'Cash'),
(2, 1, 3000, 'Cheque'),
(3, 2, 4000, 'Cheque'),
(4, 2, 1000, 'Cheque');
INSERT INTO dbo.Ledger
(LedgerId, Recptno, FundType, amount)
VALUES
(1, 1, 'R', 500),
(2, 1, 'A', 500),
(3, 1, 'I', 1000),
(4, 1, 'I', 1000),
(5, 1, 'I', 1000),
(6, 2, 'R', 2000),
(7, 2, 'A', 1000),
(8, 2, 'I', 2000);
用法：
EXECUTE [dbo].[MatchLedgerRecords];
输出：
源代码：
using System.Data;
using System.Data.SqlClient;
using Microsoft.SqlServer.Server;
public partial class StoredProcedures
{
[SqlProcedure]
public static void MatchLedgerRecords()
{
SqlConnectionStringBuilder scb = new SqlConnectionStringBuilder();
// Use a context connection to find the name of the server and current database
using (SqlConnection conn = new SqlConnection("context connection = true"))
{
conn.Open();
SqlCommand cmd = new SqlCommand(@"SELECT @ServerName = @@SERVERNAME, @DatabaseName = DB_NAME()", conn);
cmd.Parameters.Add("@ServerName", SqlDbType.NVarChar, 128).Direction = ParameterDirection.Output;
cmd.Parameters.Add("@DatabaseName", SqlDbType.NVarChar, 128).Direction = ParameterDirection.Output;
cmd.ExecuteNonQuery();
// Build a connection string
scb.Enlist = false;
scb.IntegratedSecurity = true;
scb.DataSource = (string)cmd.Parameters[0].Value;
scb.InitialCatalog = (string)cmd.Parameters[1].Value;
}
// Non-context-connections
using (SqlConnection conn1 = new SqlConnection(scb.ConnectionString), conn2 = new SqlConnection(scb.ConnectionString))
{
conn1.Open();
conn2.Open();
// Commands to read the two tables in the required order
SqlCommand paymentCommand = new SqlCommand(
@"
SELECT
PaymentID,
RecptNo,
Amount,
PayModeType
FROM dbo.PaymentDetail
ORDER BY
PaymentID;", conn1);
SqlCommand ledgerCommand = new SqlCommand(
@"
SELECT
LedgerID,
RecptNo,
FundType,
Amount
FROM dbo.Ledger
ORDER BY
LedgerID;", conn2);
// Avoid default 30 second timeout
paymentCommand.CommandTimeout = 300;
ledgerCommand.CommandTimeout = 300;
// Shape of the results
SqlMetaData[] smd = new SqlMetaData[]
{
new SqlMetaData("PaymentID", SqlDbType.Int),
new SqlMetaData("LedgerID", SqlDbType.Int),
new SqlMetaData("FundType", SqlDbType.Char, 1),
new SqlMetaData("Amount", SqlDbType.Float),
new SqlMetaData("PayModeType", SqlDbType.VarChar, 20)
};
SqlDataRecord sdr = new SqlDataRecord(smd);
// Indicate start-of-results to SQL Server
SqlContext.Pipe.SendResultsStart(sdr);
// Main algorithm
using (SqlDataReader paymentReader = paymentCommand.ExecuteReader(), ledgerReader = ledgerCommand.ExecuteReader())
{
if (ledgerReader.Read() && paymentReader.Read())
{
// Read the first ledger row column values
// (ordinal numbers are the column position from the original SELECT)
int LedgerID = ledgerReader.GetInt32(0);
int LedgerReceiptNo = ledgerReader.GetInt32(1);
string FundType = ledgerReader.GetString(2);
double LedgerAmount = ledgerReader.GetDouble(3);
// Read the first payment row column values
int PaymentID = paymentReader.GetInt32(0);
int PaymentReceiptNo = paymentReader.GetInt32(1);
double PaymentAmount = paymentReader.GetDouble(2);
string PayModeType = paymentReader.GetString(3);
// A modified merge join
while (true)
{
// Join on receipt number
if (LedgerRece
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