sql - Next biggest value or next unique value in VARCHAR field -


i've run rather unique request in system work on that's running on t-sql db. have table looks in basic form:

create table merchants (     id          int not null identity(1,1) primary key,     partnerid   int,     externalref varchar(10),     name        varchar(max) )

externalref varchar(10) field in carry reference number provided 1 of number of external parties. therefor unique within scope defined partnerid value.

the problem i'm having 1 partner doesn't have values provide , wants generate values them. that's easy enough, use incrementing integer values , convert them varchar. before assigning new value select max(externalref) partnerid = @partnerid, convert integer, add 1 value , convert varchar. in fact, dbms of conversion implicitly , should work fine:

select @newref = max(externalref)+1 merchants partnerid = @partnerid

but concern is, if 1 of values partner alphanumeric value , gets returned select max(externalref) call? above approach fail in ugly way , i'm not aware of way "increment" alphanumeric string, whatever means.

so need way come unique varchar(10) value not exist in table. generate random value, check if in table , repeat if i'm not mad approach either. if there use in where clause limit results values numeric only, have worked can't think of elegant way that. like:

select @newref = coalesce(max(externalref), 0)+1 merchants partnerid = @partnerid     , externref numeric

would have suggestions on how can generate "next biggest" varchar value on field or unique value without taking processing?

oh, i've figured out. turns out imagined "is numeric" condition wasn't far fetched. of sql server 2008 there isnumeric function. varchar representation of next biggest integer value in varchar field, here's i'm doing now:

select @newref = coalesce(max(externalref), 0)+1 merchants partnerid = @partnerid     , isnumeric(externref) = 1

Comments

Post a Comment

Popular posts from this blog

commonjs - How to write a typescript definition file for a node module that exports a function? -

consider, toml node module can use: // toml.d.ts declare module toml { export function parse(value:string):any; } declare module "toml" { export = toml; } then: /// <reference path="../../../../../defs/toml/toml.d.ts"/> import toml = require('toml'); toml.parse(...); however, node module export single function, such 'glob' ( https://github.com/isaacs/node-glob ). the node usage of module be: var glob = require("glob") glob("*.js", {}, callback(err, files) { ... }); you'd naively expect this: // glob.d.ts declare function globs(paths:string, options:any, callback:{(err:any, files:string[]):void; ...but because typescripts 'import' semantics bit strange, seems can use 'import .. = require()' statement alias modules . trying call: /// <reference path="../../../../../defs/glob/glob.d.ts"/> import blog = require('glob'); results in: error ts2072: mod...
Read more

openid - Okta: Failed to get authorization code through API call -

i'm integrating okta own idp server using okta's api. i'm implementing authorization code flow following steps below: in own server, use /api/v1/authn endpoint sessiontoken. use sessiontoken obtain authorization calling endpoint: /oauth2/v1/authorize?client_id=" + clientid + "&sessiontoken=" + sessiontoken + "&response_type=code&response_mode=query&scope=openid&redirect_uri=" + redirecturl + "&state=evanyang&nonce=" it's supposed return response status code 302 , location header containing redirect url code value. however, keep getting response status code 200 , without location header, html body saying "you using unsupported browser." , "javascript disabled on browser." according api documentation: http://developer.okta.com/docs/api/resources/oidc.html#authentication-request , sessiontoken parameter sufficient this: an okta one-time sessiontoken. allows api-based ...
Read more

ios - Change Storyboard View using Seague -

i have following code checks connection server, , depending on want change views if no connection found. nsstring *connect = [nsstring stringwithcontentsofurl:[nsurl urlwithstring:@"http://myserver.com"] encoding:nsutf8stringencoding error:nil]; if (connect == null) { [self performseguewithidentifier:@"network_failure" sender:self]; } else { // other code here } my problem not change views. have added storyboard segue between 2 views identifier of network_failure . not have navigation controller or that, problem? thanks help! no not problem. first of all, in objectivec exists nil object oriented null . must use that. so: if(connect == nil) or better: if(!connect) so due fact nil not same of null , probably code does't enter in if scope . you have been able discover breakpoint. anyway: be sure set trigger segue (line) 2 view controller , , name network_failure (that not best name. should instead view1toview2 ) as, m...
Read more