Some useful SQL queries to get web, site and list data:
1) Query to get all the top level site collections
SELECT SiteId AS SiteGuid, Id AS WebGuid, FullUrl AS Url, Title, Author, TimeCreated
FROM dbo.Webs
WHERE (ParentWebId IS NULL)
2) Query to get all the child sites in a site collection
SELECT SiteId AS SiteGuid, Id AS WebGuid, FullUrl AS Url, Title, Author, TimeCreated
FROM dbo.Webs
WHERE (NOT (ParentWebId IS NULL))
3) Query to get all the SharePoint groups in a site collection
SELECT dbo.Webs.SiteId, dbo.Webs.Id, dbo.Webs.FullUrl, dbo.Webs.Title, dbo.Groups.ID AS Expr1,
dbo.Groups.Title AS Expr2, dbo.Groups.Description
FROM dbo.Groups INNER JOIN
dbo.Webs ON dbo.Groups.SiteId = dbo.Webs.SiteId
4) Query to get all the users in a site collection
SELECT dbo.Webs.SiteId, dbo.Webs.Id, dbo.Webs.FullUrl, dbo.Webs.Title, dbo.UserInfo.tp_ID,
dbo.UserInfo.tp_DomainGroup, dbo.UserInfo.tp_SiteAdmin, dbo.UserInfo.tp_Title, dbo.UserInfo.tp_Email
FROM dbo.UserInfo INNER JOIN
dbo.Webs ON dbo.UserInfo.tp_SiteID = dbo.Webs.SiteId
5) Query to get all the members of the SharePoint Groups
(i) All the members in all the SharePoint Groups in a web application.
SELECT dbo.Groups.ID, dbo.Groups.Title, dbo.UserInfo.tp_Title, dbo.UserInfo.tp_Login
FROM dbo.GroupMembership INNER JOIN
dbo.Groups ON dbo.GroupMembership.SiteId = dbo.Groups.SiteId INNER JOIN
dbo.UserInfo ON dbo.GroupMembership.MemberId = dbo.UserInfo.tp_ID
(ii)All the members in each SharePoint Group in a web application.
SELECT dbo.Groups.ID, dbo.Groups.Title, dbo.UserInfo.tp_Title, dbo.UserInfo.tp_Login
FROM dbo.GroupMembership with (nolock)
INNER JOIN dbo.Groups with (nolock)
ON dbo.GroupMembership.GroupId = Groups.ID
INNER JOIN dbo.UserInfo
ON dbo.GroupMembership.MemberId = dbo.UserInfo.tp_ID
6) Query to get all the sites where a specific feature is activated
SELECT dbo.Webs.Id AS WebGuid, dbo.Webs.Title AS WebTitle, dbo.Webs.FullUrl AS WebUrl, dbo.Features.FeatureId,
dbo.Features.TimeActivated
FROM dbo.Features INNER JOIN
dbo.Webs ON dbo.Features.SiteId = dbo.Webs.SiteId AND dbo.Features.WebId = dbo.Webs.Id
WHERE (dbo.Features.FeatureId = ’00DGEA71-E2FE-42de-9DF3-A44065BE0104′)
7) Query to get all the users assigned to roles
SELECT dbo.Webs.Id, dbo.Webs.Title, dbo.Webs.FullUrl, dbo.Roles.RoleId, dbo.Roles.Title AS RoleTitle,
dbo.UserInfo.tp_Title, dbo.UserInfo.tp_Login
FROM dbo.RoleAssignment INNER JOIN
dbo.Roles ON dbo.RoleAssignment.SiteId = dbo.Roles.SiteId AND
dbo.RoleAssignment.RoleId = dbo.Roles.RoleId INNER JOIN
dbo.Webs ON dbo.Roles.SiteId = dbo.Webs.SiteId AND dbo.Roles.WebId = dbo.Webs.Id INNER JOIN
dbo.UserInfo ON dbo.RoleAssignment.PrincipalId = dbo.UserInfo.tp_ID
8) Query to get all the SharePoint groups assigned to roles
SELECT dbo.Webs.Id, dbo.Webs.Title, dbo.Webs.FullUrl, dbo.Roles.RoleId, dbo.Roles.Title AS RoleTitle,
dbo.Groups.Title AS GroupName
FROM dbo.RoleAssignment INNER JOIN
dbo.Roles ON dbo.RoleAssignment.SiteId = dbo.Roles.SiteId AND
dbo.RoleAssignment.RoleId = dbo.Roles.RoleId INNER JOIN
dbo.Webs ON dbo.Roles.SiteId = dbo.Webs.SiteId AND dbo.Roles.WebId = dbo.Webs.Id INNER JOIN
dbo.Groups ON dbo.RoleAssignment.SiteId = dbo.Groups.SiteId AND
dbo.RoleAssignment.PrincipalId = dbo.Groups.ID