Firebird check if table exists
WebMay 26, 2014 · Firebird dispone de un predicado llamado EXISTS () el cual nos dice si el resultado de un SELECT tiene al menos una fila. La forma general de usarlo es la siguiente: 1 EXISTS (MiConsulta) Ejemplo 1: Esta consulta nos mostrará todos los productos cuya cantidad vendida en una Factura sea mayor o igual que 10. Ejemplo 2: WebMar 19, 2013 · You can query RDB$RELATION_CONSTRAINTS table, if you know the name of the constraint. Something like this: set term ^; execute block as begin if (exists ( select 0 from rdb$relation_constraints where rdb$constraint_name = 'INTEG_669' )) then execute statement 'alter table process_category drop constraint INTEG_669'; end ^ set …
Firebird check if table exists
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WebSep 8, 2015 · I want to check does some data table exists inside of database and if it is true to enable additional inputs. I've tried with google but all examples which I could … http://firebirdsql.org/refdocs/langrefupd21-ddl-procedure.html
WebDec 29, 2016 · If table T has columns C1 and C2 and you are checking for existence of row groups that match a specific condition, you can use SELECT 1 like this: EXISTS ( SELECT 1 FROM T GROUP BY C1 … WebJul 24, 2012 · How to see if a record exists in firebird table Hi, could someone help me on this I want to see if a record exists in a table, through rdb$database (so I can see if another user has appended that value) I use this code, but it doesn't work Agendaquery.Close; Agendaquery.SQL.Text:= 'SELECT * FROM AGENDA '+
WebJun 16, 2012 · As I understand the question, you want to know whether a null exists in any of the columns values as opposed to actually returning the rows in which either B or C is null. If that is the case, then why not: Select Top 1 'B as nulls' As Col From T Where T.B Is Null Union All Select Top 1 'C as nulls' From T Where T.C Is Null WebDescription: If the procedure does not yet exist, it is created just as if CREATE PROCEDURE were used. If it already exists, it is altered and recompiled. Existing permissions and dependencies are preserved. Syntax: Exactly the same as for CREATE PROCEDURE . DROP PROCEDURE Available in: DSQL, ESQL Restriction on dropping …
WebADD ADD CONSTRAINT ALL ALTER ALTER COLUMN ALTER TABLE AND ANY AS ASC BACKUP DATABASE BETWEEN CASE CHECK COLUMN ... The SQL EXISTS Operator. The EXISTS operator is used to test for the existence of any record in a subquery. The EXISTS operator returns TRUE if the subquery returns one or more records. EXISTS …
Webas the table contents, issue the DROP statement. If SQL finds an error while running your DELETE statement, it stops deleting data and returns a negative SQLCODE. If you specify COMMIT(*ALL), COMMIT(*CS), COMMIT(*CHG), or COMMIT(*RR), no rows in the table are deleted (rows already deleted by this statement, if any, are restored office space west springfield maWebMar 30, 2024 · There is a column that can have several values. I want to select a count of how many times each distinct value occurs in the entire set. I feel like there's probably an obvious sol Solution 1: SELECT CLASS , COUNT (*) FROM MYTABLE GROUP BY CLASS Copy Solution 2: select class , count( 1 ) from table group by class Copy Solution 3: … office space west loopWebMar 19, 2013 · You can query RDB$RELATION_CONSTRAINTS table, if you know the name of the constraint. Something like this: Something like this: set term ^; execute block … office space watch full movieWebTo check if table exists in a database you need to use a Select statement on the information schema TABLES or you can use the metadata function OBJECT_ID (). The INFORMATION_SCHEMA.TABLES returns one row for each table in the current database. The OBJECT_ID () function returns the database object id number if the object exists in … office space watch moviehttp://www.firebirdfaq.org/faq373/ my dog is throwing up everything he eatsWebDescription: Creates a trigger, a block of PSQL code that is executed automatically upon certain database events or mutations to a table or view. Syntax: CREATE TRIGGER name{ } AS [] BEGIN [] END office space wayzata mnWebSep 22, 2024 · There are some old versions of tables without a primary key. Most users already have that primary key added in their version of tables. I must add primary keys to missing tables only. There is... office space weymouth ma