mit Apache Derby (10.12.1.1), habe ich die folgenden Tabellen:Apache Derby: Spaltenreferenz 'xx' ist ungültig oder Teil eines ungültigen Ausdrucks.
CREATE TABLE ROWCONTENT(
ID INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1) PRIMARY KEY,
MD5SUM CHAR(32) UNIQUE,
CONTENT CLOB,
CONTIG VARCHAR(20),
START INT,
STOP INT,
REF VARCHAR(50) NOT NULL
);
CREATE TABLE VCF(
ID INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1) PRIMARY KEY,
NAME VARCHAR(255)
);
CREATE TABLE VCFROW(
ID INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1) PRIMARY KEY,
VCF_ID INTEGER CONSTRAINT row2vcf REFERENCES VCF,
ROW_ID INTEGER CONSTRAINT row2content REFERENCES ROWCONTENT
);
aber wenn ich versuche, eine SELECT die folgende Anweisung
SELECT
VCF.ID,VCF.NAME, COUNT(VCFROW.ID) as "COUNT_VARIANTS"
FROM
VCF,VCFROW,ROWCONTENT
WHERE
VCFROW.VCF_ID=VCF.ID AND
VCFROW.ROW_ID = ROWCONTENT.ID AND
ROWCONTENT.CONTIG IS NOT NULL
GROUP BY VCF.ID
ich mit bekommen die folgende Ausnahme:
java.sql.SQLSyntaxErrorException: Column reference 'VCF.NAME' is invalid, or is part of an invalid expression. For a SELECT list with a GROUP BY, the columns and expressions being selected may only contain valid grouping expressions and valid aggregate expressions.
at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedStatement.executeQuery(Unknown Source)
Wissen Sie warum? Danke.