The easiest way is to not store the count, relying on the COUNT aggregate function to reflect the value as it is in the database: SELECT c.category_name, COUNT(p.post_id) AS num_posts FROM CATEGORY c LEFT JOIN POSTS p ON p.category_id = c.category_id You can create a view to house the query mentioned above, so you can … Read more
if you don’t use the WHERE clause all the records on the table will be affected
You can try putting the group by inside of a subquery, then join by the “JobOrderID”, like this: UPDATE J SET J.StatusID = A.statusId FROM MKT_JobOrder J INNER JOIN ( SELECT J.JobOrderID , CASE WHEN SUM(DUV.VendorDUQuantity) = SUM(RD.InvoiceQuantity) THEN 1 ELSE J.StatusID END AS statusId FROM PLN_DU_Vendor DUV INNER JOIN ENG_Release R ON R.ReleaseID = … Read more
In the following example, the entity is obtained by the context, so the context begins tracking it immediately. When you alter property values on a tracked entity, the context changes the EntityState for the entity to Modified and the ChangeTracker records the old property values and the new property values. When SaveChanges is called, an … Read more
As per the MySQL docs for UPDATE: For the multiple-table syntax, UPDATE updates rows in each table named in table_references that satisfy the conditions. In this case, ORDER BY and LIMIT cannot be used.
You are probably looking for the replace function. For example, update table_name set content_url = replace(content_url, ‘band%20albums’, ‘bands/studio%20albums’) where content_url like ‘%nazgulled/music/band_20albums/%’; More documentation at http://sqlite.org/lang_corefunc.html
The SET needs to come before the FROM\JOIN\WHERE portion of the query. UPDATE CE SET sJobNumber = AD.JobNumber FROM CostEntry CE INNER JOIN ActiveCostDetails As AD ON CE.lUniqueID = AD.UniqueID WHERE CE.SEmployeeCode=”002″ AND SubString(CostCentre, 1, 1) = sDepartmentCode AND substring(CostCentre, 3, 1) = sCategoryCode AND substring(CostCentre, 5, 2) = sOperationCode
Try this Query: update tablename set col1name = concat(ifnull(col1name,””), ‘a,b,c’); Refer this sql fiddle demo.
Unfortunately it’s not very clear what you want to get in the end, but here is how you could correctly use conditional SET in your UPDATE UPDATE relation SET name1 = CASE WHEN userid1 = 3 THEN ‘jack’ ELSE name1 END, name2 = CASE WHEN userid2 = 3 THEN ‘jack’ ELSE name2 END WHERE (userid1 … Read more
If you’re able to upgrade to Postgresql 9.5, the jsonb_set command is available, as others have mentioned. In each of the following SQL statements, I’ve omitted the where clause for brevity; obviously, you’d want to add that back. Update name: UPDATE test SET data = jsonb_set(data, ‘{name}’, ‘”my-other-name”‘); Replace the tags (as oppose to adding … Read more