fixed sql error.

CAP.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
-VisualStudioVersion = 15.0.26430.16
+VisualStudioVersion = 15.0.26730.0
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{9B2AE124-6636-4DE9-83A3-70360DABD0C4}"
 EndProject
@@ -65,6 +65,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Sample.RabbitMQ.MySql", "sa
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Sample.Kafka.SqlServer", "samples\Sample.Kafka.SqlServer\Sample.Kafka.SqlServer.csproj", "{AF17B956-B79E-48B7-9B5B-EB15A386B112}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DotNetCore.CAP.PostgreSql", "src\DotNetCore.CAP.PostgreSql\DotNetCore.CAP.PostgreSql.csproj", "{82C403AB-ED68-4084-9A1D-11334F9F08F9}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -110,6 +112,10 @@ Global
 		{AF17B956-B79E-48B7-9B5B-EB15A386B112}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{AF17B956-B79E-48B7-9B5B-EB15A386B112}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{AF17B956-B79E-48B7-9B5B-EB15A386B112}.Release|Any CPU.Build.0 = Release|Any CPU
+		{82C403AB-ED68-4084-9A1D-11334F9F08F9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{82C403AB-ED68-4084-9A1D-11334F9F08F9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{82C403AB-ED68-4084-9A1D-11334F9F08F9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{82C403AB-ED68-4084-9A1D-11334F9F08F9}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -126,5 +132,9 @@ Global
 		{80A84F62-1558-427B-BA74-B47AA8A665B5} = {C09CDAB0-6DD4-46E9-B7F3-3EF2A4741EA0}
 		{9F3F9BFE-7B6A-4A7A-A6E6-8B517D611873} = {3A6B6931-A123-477A-9469-8B468B5385AF}
 		{AF17B956-B79E-48B7-9B5B-EB15A386B112} = {3A6B6931-A123-477A-9469-8B468B5385AF}
+		{82C403AB-ED68-4084-9A1D-11334F9F08F9} = {9B2AE124-6636-4DE9-83A3-70360DABD0C4}
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {2E70565D-94CF-40B4-BFE1-AC18D5F736AB}
 	EndGlobalSection
 EndGlobal

src/DotNetCore.CAP.PostgreSql/CapPublisher.cs

@@ -20,6 +20,7 @@ namespace DotNetCore.CAP.PostgreSql
             ILogger<CapPublisher> logger,
             PostgreSqlOptions options)
         {
+            ServiceProvider = provider;
             _options = options;
             _logger = logger;
 

src/DotNetCore.CAP.PostgreSql/IAdditionalProcessor.Default.cs

@@ -43,7 +43,7 @@ namespace DotNetCore.CAP.PostgreSql
                 {
                     using (var connection = new NpgsqlConnection(_options.ConnectionString))
                     {
-                        removedCount = await connection.ExecuteAsync($"DELETE FROM \"{_options.Schema}\".\"{table}\" WHERE ExpiresAt < @now LIMIT @count;",
+                        removedCount = await connection.ExecuteAsync($"DELETE FROM \"{_options.Schema}\".\"{table}\" WHERE \"ExpiresAt\" < @now AND \"Id\" IN (SELECT \"Id\" FROM \"{_options.Schema}\".\"{table}\" LIMIT @count);",
                             new { now = DateTime.Now, count = MaxBatch });                        
                     }
 

src/DotNetCore.CAP/Abstractions/CapPublisherBase.cs

@@ -16,7 +16,7 @@ namespace DotNetCore.CAP.Abstractions
 
         protected bool IsUsingEF { get; set; }
 
-        protected IServiceProvider ServiceProvider { get; }
+        protected IServiceProvider ServiceProvider { get; set; }
          
         public void Publish<T>(string name, T contentObj)
         {