I want to combine columns in two tables and use the exported resulting
table for statistical analyses. The SQL script is:
INSERT INTO waterchem (site, sampdate, param, quant, ceneq1, low, high,
stream, basin)
SELECT c.site, c.sampdate, c.param, c.quant, c.ceneq1, c.low, c.high,
s.stream, s.basin
FROM chemistry as c, sites as s
WHERE c.site == s.siteid;
The problem is that both c.site and s.siteid are of type VARCHAR(16) and
postgres tells me,
ERROR: operator does not exist: character varying == character varying
and provides the hint to add explicit type casts. Since the string length of
site/siteid varies I don't see how to cast both to a working type.
Please suggest how I can populate this table while avoiding the operator
error.
Rich
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