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SQL/LINQ/Lamda

2014-01-15 17:16 387 查看
SQL
LINQ

Lambda

SELECT *
FROM HumanResources.Employee
from e in Employees
select e
Employees

   .Select (e => e)
SELECT e.LoginID, e.JobTitle
FROM HumanResources.Employee AS e
from e in Employees
select new {e.LoginID, e.JobTitle}
Employees

   .Select (

      e =>

         new

         {

            LoginID = e.LoginID,

            JobTitle = e.JobTitle

         }

   )
SELECT e.LoginID AS ID, e.JobTitle AS Title
FROM HumanResources.Employee AS e
from e in Employees
select new {ID = e.LoginID, Title = e.JobTitle}
Employees

   .Select (

      e =>

         new

         {

            ID = e.LoginID,

            Title = e.JobTitle

         }

   )
SELECT DISTINCT e.JobTitle
FROM HumanResources.Employee AS e
(from e in Employees
select e.JobTitle).Distinct()
Employees

   .Select (e => e.JobTitle)

   .Distinct ()
SELECT e.*
FROM HumanResources.Employee AS e
WHERE e.LoginID = 'test'
from e in Employees
where e.LoginID == "test"
select e
Employees

   .Where (e => (e.LoginID == "test"))
SELECT e.*
FROM HumanResources.Employee AS e
WHERE e.LoginID = 'test' AND e.SalariedFlag = 1
from e in Employees
where e.LoginID == "test" && e.SalariedFlag
select e
Employees

   .Where (e => ((e.LoginID == "test") && e.SalariedFlag))
SELECT e.*

FROM HumanResources.Employee AS e
WHERE e.VacationHours >= 2 AND e.VacationHours <= 10
from e in Employees
where e.VacationHours >= 2 && e.VacationHours <= 10
select e
Employees

   .Where (e => (((Int32)(e.VacationHours) >= 2) && ((Int32)(e.VacationHours) <= 10)))
SELECT e.*
FROM HumanResources.Employee AS e

ORDER BY e.NationalIDNumber
from e in Employees
orderby e.NationalIDNumber
select e
Employees

   .OrderBy (e => e.NationalIDNumber)
SELECT e.*
FROM HumanResources.Employee AS e
ORDER BY e.HireDate DESC, e.NationalIDNumber
from e in Employees
orderby e.HireDate descending, e.NationalIDNumber
select e
Employees

   .OrderByDescending (e => e.HireDate)

   .ThenBy (e => e.NationalIDNumber)
SELECT e.*

FROM HumanResources.Employee AS e
WHERE e.JobTitle LIKE 'Vice%' OR SUBSTRING(e.JobTitle, 0, 3) = 'Pro'
from e in Employees
where e.JobTitle.StartsWith("Vice") || e.JobTitle.Substring(0, 3) == "Pro"
select e
Employees

   .Where (e => (e.JobTitle.StartsWith ("Vice") || (e.JobTitle.Substring (0, 3) == "Pro")))
SELECT SUM(e.VacationHours)
FROM HumanResources.Employee AS e
 
Employees.Sum(e => e.VacationHours);
SELECT COUNT(*)
FROM HumanResources.Employee AS e
 
Employees.Count();
SELECT SUM(e.VacationHours) AS TotalVacations, e.JobTitle
FROM HumanResources.Employee AS e
GROUP BY e.JobTitle
from e in Employees
group e by e.JobTitle into g
select new {JobTitle = g.Key, TotalVacations = g.Sum(e => e.VacationHours)}
Employees

   .GroupBy (e => e.JobTitle)

   .Select (

      g =>

         new

         {

            JobTitle = g.Key,

            TotalVacations = g.Sum (e => (Int32)(e.VacationHours))

         }

   )
SELECT e.JobTitle, SUM(e.VacationHours) AS TotalVacations
FROM HumanResources.Employee AS e
GROUP BY e.JobTitle
HAVING e.COUNT(*) > 2
from e in Employees
group e by e.JobTitle into g
where g.Count() > 2
select new {JobTitle = g.Key, TotalVacations = g.Sum(e => e.VacationHours)}
Employees

   .GroupBy (e => e.JobTitle)

   .Where (g => (g.Count () > 2))

   .Select (

      g =>

         new

         {

            JobTitle = g.Key,

            TotalVacations = g.Sum (e => (Int32)(e.VacationHours))

         }

   )
SELECT *
FROM Production.Product AS p, Production.ProductReview AS pr
from p in Products
from pr in ProductReviews
select new {p, pr}
Products

   .SelectMany (

      p => ProductReviews,

      (p, pr) =>

         new

         {

            p = p,

            pr = pr

         }

   )
SELECT *
FROM Production.Product AS p
INNER JOIN Production.ProductReview AS pr ON p.ProductID = pr.ProductID
from p in Products
join pr in ProductReviews on p.ProductID equals pr.ProductID
select new {p, pr}
Products

   .Join (

      ProductReviews,

      p => p.ProductID,

      pr => pr.ProductID,

      (p, pr) =>

         new

         {

            p = p,

            pr = pr

         }

   )
SELECT *
FROM Production.Product AS p
INNER JOIN Production.ProductCostHistory AS pch ON p.ProductID = pch.ProductID AND p.SellStartDate = pch.StartDate
from p in Products
join pch in ProductCostHistories on new {p.ProductID, StartDate = p.SellStartDate} equals new {pch.ProductID, StartDate = pch.StartDate}
select new {p, pch}
Products

   .Join (

      ProductCostHistories,

      p =>

         new

         {

            ProductID = p.ProductID,

            StartDate = p.SellStartDate

         },

      pch =>

         new

         {

            ProductID = pch.ProductID,

            StartDate = pch.StartDate

         },

      (p, pch) =>

         new

         {

            p = p,

            pch = pch

         }

   )
SELECT *
FROM Production.Product AS p
LEFT OUTER JOIN Production.ProductReview AS pr ON p.ProductID = pr.ProductID
from p in Products
join pr in ProductReviews on p.ProductID equals pr.ProductID
into prodrev
select new {p, prodrev}
Products

   .GroupJoin (

      ProductReviews,

      p => p.ProductID,

      pr => pr.ProductID,

      (p, prodrev) =>

         new

         {

            p = p,

            prodrev = prodrev

         }

   )
SELECT p.ProductID AS ID
FROM Production.Product AS p
UNION
SELECT pr.ProductReviewID
FROM Production.ProductReview AS pr
(from p in Products
select new {ID = p.ProductID}).Union(
from pr in ProductReviews
select new {ID = pr.ProductReviewID})
Products

   .Select (

      p =>

         new

         {

            ID = p.ProductID

         }

   )

   .Union (

      ProductReviews

         .Select (

            pr =>

               new

               {

                  ID = pr.ProductReviewID

               }

         )

   )
SELECT TOP (10) *
FROM Production.Product AS p
WHERE p.StandardCost < 100
(from p in Products
where p.StandardCost < 100
select p).Take(10)
Products

   .Where (p => (p.StandardCost < 100))

   .Take (10)
SELECT *
FROM [Production].[Product] AS p
WHERE p.ProductID IN(
    SELECT pr.ProductID
    FROM [Production].[ProductReview] AS [pr]
    WHERE pr.[Rating] = 5
    )
from p in Products
where (from pr in ProductReviews
where pr.Rating == 5
select pr.ProductID).Contains(p.ProductID)
select p
Products

   .Where (

      p =>

         ProductReviews

            .Where (pr => (pr.Rating == 5))

            .Select (pr => pr.ProductID)

            .Contains (p.ProductID)

   )
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