diff --git a/autoload/vim_dadbod_completion/job.vim b/autoload/vim_dadbod_completion/job.vim
index 832e6e5..45fdd75 100644
--- a/autoload/vim_dadbod_completion/job.vim
+++ b/autoload/vim_dadbod_completion/job.vim
@@ -54,7 +54,11 @@ function! vim_dadbod_completion#job#run(cmd, callback) abort
       let opts['noblock'] = 1
     endif
 
-    return job_start([&shell, '-c', a:cmd], opts)
+    if has('win32')
+        return job_start(printf('%s %s %s', &shell, &shellcmdflag, a:cmd), opts)
+    else
+        return job_start([&shell, &shellcmdflag, a:cmd], opts)
+    endif
   endif
 
   let list = systemlist(a:cmd)
diff --git a/autoload/vim_dadbod_completion/schemas.vim b/autoload/vim_dadbod_completion/schemas.vim
index fc737f1..b61cc86 100644
--- a/autoload/vim_dadbod_completion/schemas.vim
+++ b/autoload/vim_dadbod_completion/schemas.vim
@@ -1,6 +1,6 @@
 let s:base_column_query = 'select table_name,column_name from information_schema.columns'
 let s:query = s:base_column_query.' order by column_name asc'
-let s:count_query = 'select count(*) as "total" from information_schema.columns'
+let s:count_query = 'select count(*) as total from information_schema.columns'
 let s:table_column_query = s:base_column_query.' where table_name={db_tbl_name}'
 
 function! s:map_and_filter(delimiter, list) abort
@@ -15,8 +15,8 @@ function! s:count_parser(index, result) abort
 endfunction
 
 let s:postgres = {
-      \ 'column_query': printf("-A -c '%s'", s:query),
-      \ 'count_column_query': printf("-A -c '%s'", s:count_query),
+      \ 'column_query': printf('-A -c "%s"', s:query),
+      \ 'count_column_query': printf('-A -c "%s"', s:count_query),
       \ 'table_column_query': {table -> printf('-A -c "%s"', substitute(s:table_column_query, '{db_tbl_name}', "'".table."'", ''))},
       \ 'quote': 1,
       \ 'column_parser': function('s:map_and_filter', ['|']),
@@ -27,16 +27,16 @@ let s:schemas = {
       \ 'postgres': s:postgres,
       \ 'postgresql': s:postgres,
       \ 'mysql': {
-      \   'column_query': printf("-e '%s'", s:query),
-      \   'count_column_query': printf("-e '%s'", s:count_query),
+      \   'column_query': printf('-e "%s"', s:query),
+      \   'count_column_query': printf('-e "%s"', s:count_query),
       \   'table_column_query': {table -> printf('-e "%s"', substitute(s:table_column_query, '{db_tbl_name}', "'".table."'", ''))},
       \   'quote': 0,
       \   'column_parser': function('s:map_and_filter', ['\t']),
       \   'count_parser': function('s:count_parser', [1])
       \ },
       \ 'sqlserver': {
-      \   'column_query': printf("-h-1 -W -s '|' -Q '%s'", s:query),
-      \   'count_column_query': printf("-h-1 -W -Q '%s'", s:count_query),
+      \   'column_query': printf('-h-1 -W -s "|" -Q "%s"', s:query),
+      \   'count_column_query': printf('-h-1 -W -Q "%s"', s:count_query),
       \   'table_column_query': {table -> printf('-h-1 -W -Q "%s"', substitute(s:table_column_query, '{db_tbl_name}', "'".table."'", ''))},
       \   'quote': 0,
       \   'column_parser': function('s:map_and_filter', ['|']),